UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                 SCHEDULE 13D/A
                    Under the Securities Exchange Act of 1934

                                 Amendment No. 2

                                 GSI Group Inc.
--------------------------------------------------------------------------------
                                (Name of Issuer)

                           Common Stock, no par value
--------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                    36229U102
--------------------------------------------------------------------------------
                                 (CUSIP Number)

                                Stephanie S. Chen
                          c/o Tinicum Lantern II L.L.C.
                          800 Third Avenue, 40th Floor
                               New York, NY 10022
                                  212-446-9300

--------------------------------------------------------------------------------
(Name, Address and Telephone Number of Person Authorized to Receive Notices and
                                 Communications)

                                 March 12, 2010
                               ------------------
             (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition that is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following box
[ ].

Note: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Rule 13d-7 for other parties
to whom copies are to be sent.

--------------------
* The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the
Notes).

                         (Continued on following pages)
                               (Page 1 of 7 Pages)





----------------------------                        ----------------------------
CUSIP No.  36229U102            SCHEDULE 13D/A        Page 2 of 7 Pages
----------------------------                        ----------------------------
------------- -----------------------------------------------------------------
     1        NAME OF REPORTING PERSON

              Tinicum Capital Partners II, L.P.
-------------------------------------------------------------------------------
     2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) |_|  (b) |X|

------------- -----------------------------------------------------------------
     3        SEC USE ONLY
------------- -----------------------------------------------------------------
     4        SOURCE OF FUNDS

              WC, OO
------------- -----------------------------------------------------------------
     5        CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
              TO ITEMS 2(d) or 2(e)     |_|
------------- -----------------------------------------------------------------
     6        CITIZENSHIP OR PLACE OF ORGANIZATION

              Delaware
------------- -----------------------------------------------------------------
 NUMBER OF    7           SOLE VOTING POWER

   SHARES                 0
              ----------- -----------------------------------------------------
BENEFICIALLY  8           SHARED VOTING POWER

   OWNED                  418,464
              ----------- -----------------------------------------------------
  BY EACH     9           SOLE DISPOSITIVE POWER

 REPORTING                0
              ----------- -----------------------------------------------------
  PERSON      10          SHARED DISPOSITIVE POWER

                          418,464
------------- ----------- -----------------------------------------------------
     11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

              418,464
------------- -----------------------------------------------------------------
     12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
              SHARES |_|
------------- -----------------------------------------------------------------
     13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

              0.8% (see Item 4)
------------- -----------------------------------------------------------------
     14       TYPE OF REPORTING PERSON
              PN
------------- -----------------------------------------------------------------





----------------------------                        ----------------------------
CUSIP No.  36229U102            SCHEDULE 13D/A        Page 3 of 7 Pages
----------------------------                        ----------------------------
------------- -----------------------------------------------------------------
     1        NAME OF REPORTING PERSON

              Tinicum Lantern II L.L.C.

------------- -----------------------------------------------------------------
     2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) |_|  (b) |X|

------------- -----------------------------------------------------------------
     3        SEC USE ONLY
------------- -----------------------------------------------------------------
     4        SOURCE OF FUNDS

              AF
------------- -----------------------------------------------------------------
     5        CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
              TO ITEMS 2(d) or 2(e)     |_|
------------- -----------------------------------------------------------------
     6        CITIZENSHIP OR PLACE OF ORGANIZATION

              Delaware
------------- -----------------------------------------------------------------
 NUMBER OF    7           SOLE VOTING POWER

   SHARES                 0
              ----------- -----------------------------------------------------
BENEFICIALLY  8           SHARED VOTING POWER

   OWNED                  418,464
              ----------- -----------------------------------------------------
  BY EACH     9           SOLE DISPOSITIVE POWER

 REPORTING                0
              ----------- -----------------------------------------------------
  PERSON      10          SHARED DISPOSITIVE POWER

                          418,464
------------- ----------- -----------------------------------------------------
     11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

              418,464
------------- -----------------------------------------------------------------
     12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
              SHARES |_|
------------- -----------------------------------------------------------------
     13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

              0.8% (see Item 4)
------------- -----------------------------------------------------------------
     14       TYPE OF REPORTING PERSON
              OO
------------- -----------------------------------------------------------------





----------------------------                        ----------------------------
CUSIP No.  36229U102            SCHEDULE 13D/A        Page 4 of 7 Pages
----------------------------                        ----------------------------
------------- -----------------------------------------------------------------
     1        NAME OF REPORTING PERSON

              Terence M. O'Toole

------------- -----------------------------------------------------------------
     2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) |_|  (b) |X|

------------- -----------------------------------------------------------------
     3        SEC USE ONLY
------------- -----------------------------------------------------------------
     4        SOURCE OF FUNDS

              AF
------------- -----------------------------------------------------------------
     5        CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
              TO ITEMS 2(d) or 2(e)     |_|
------------- -----------------------------------------------------------------
     6        CITIZENSHIP OR PLACE OF ORGANIZATION

                                  United States
------------- -----------------------------------------------------------------
 NUMBER OF    7           SOLE VOTING POWER

   SHARES                 0
              ----------- -----------------------------------------------------
BENEFICIALLY  8           SHARED VOTING POWER

   OWNED                  418,464
              ----------- -----------------------------------------------------
  BY EACH     9           SOLE DISPOSITIVE POWER

 REPORTING                0
              ----------- -----------------------------------------------------
  PERSON      10          SHARED DISPOSITIVE POWER

                          418,464
------------- ----------- -----------------------------------------------------
     11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

              418,464
------------- -----------------------------------------------------------------
     12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
              SHARES |_|
------------- -----------------------------------------------------------------
     13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

              0.8% (see Item 4)
------------- -----------------------------------------------------------------
     14       TYPE OF REPORTING PERSON
              IN
------------- -----------------------------------------------------------------





----------------------------                        ----------------------------
CUSIP No.  36229U102            SCHEDULE 13D/A        Page 5 of 7 Pages
----------------------------                        ----------------------------
------------- -----------------------------------------------------------------
     1        NAME OF REPORTING PERSON

              Eric M. Ruttenberg

------------- -----------------------------------------------------------------
     2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (a) |_|  (b) |X|

------------- -----------------------------------------------------------------
     3        SEC USE ONLY
------------- -----------------------------------------------------------------
     4        SOURCE OF FUNDS

              AF
------------- -----------------------------------------------------------------
     5        CHECK IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
              TO ITEMS 2(d) or 2(e)     |_|
------------- -----------------------------------------------------------------
     6        CITIZENSHIP OR PLACE OF ORGANIZATION

              United States
------------- -----------------------------------------------------------------
 NUMBER OF    7           SOLE VOTING POWER

   SHARES                 0
              ----------- -----------------------------------------------------
BENEFICIALLY  8           SHARED VOTING POWER

   OWNED                  418,464
              ----------- -----------------------------------------------------
  BY EACH     9           SOLE DISPOSITIVE POWER

 REPORTING                0
              ----------- -----------------------------------------------------
  PERSON      10          SHARED DISPOSITIVE POWER

                          418,464
------------- ----------- -----------------------------------------------------
     11       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

              418,464
------------- -----------------------------------------------------------------
     12       CHECK IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN
              SHARES |_|
------------- -----------------------------------------------------------------
     13       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11

              0.8% (see Item 4)
------------- -----------------------------------------------------------------
     14       TYPE OF REPORTING PERSON
              IN
------------- -----------------------------------------------------------------





----------------------------                        ----------------------------
CUSIP No.  36229U102            SCHEDULE 13D/A        Page 6 of 7 Pages
----------------------------                        ----------------------------

ITEM 1.       SECURITY AND ISSUER

     This Amendment No. 2 (the "Amendment") amends the statement on Schedule 13D
filed on January 13, 2010 (the "Original Schedule 13D", as amended hereby and by
Amendment No. 1 filed on March 3,2010,  the "Schedule  13D") with respect to the
common  stock,  no par  value  (the  "Shares"),  of GSI  Group  Inc.,  a company
continued and existing under the laws of the Province of New  Brunswick,  Canada
(the "Issuer").  Capitalized terms used herein and not otherwise defined in this
Amendment have the meanings set forth in the Schedule 13D. This Amendment amends
Item 4 as set forth below.

ITEM 4.       PURPOSE OF TRANSACTION

Item 4 of the Schedule 13D is hereby amended and supplemented by the addition of
the following:


On March  12,  2010  TCP II and the  other  Consenting  Noteholders  reached  an
agreement in principle with the Issuer Parties as to  modifications  to the Plan
Support Agreement and the Plan.


Pursuant to the modified Plan, the  Noteholders  would receive,  in exchange for
their Notes,  new convertible  preferred  stock of the  reorganized  Issuer (the
"Preferred  Stock") and New Senior Secured  Notes.  The Preferred  Stock,  on an
as-converted  basis,  would  represent   approximately  53.8%  of  the  Issuer's
post-consummation outstanding common shares. The Preferred Stock would have a 1x
liquidation  preference and be mandatorily redeemable after 8 years for cash or,
if certain  conditions are met,  common shares of the  reorganized  Issuer.  The
holders of the Preferred Stock would vote on an as converted basis together with
the holders of common  shares.  In addition,  pursuant to the modified Plan, the
aggregate  principal  amount of New Senior  Secured  Notes  being  issued to the
Noteholders will be approximately $110,000,000, increased from $95,000,000.


The  modifications  to the Plan will also include (i) increasing the recovery of
existing   equity   holders   of  the  Issuer   from   18.6%  of  the   Issuer's
post-consummation  outstanding  common shares to 41.1%, which would be issued in
common  shares  of the  reorganized  Issuer  and  (ii)  issuing  one  series  of
three-year  warrants to existing equity holders of the Issuer exercisable into a
number of common  shares equal to 10% of 110% of the Issuer's  post-consummation
outstanding common shares,  with a strike price of $2.50, rather than two series
of warrants each for 10% of 110% of the Issuer's  post-consummation  outstanding
common shares, with a strike price of $1.10 and $2.00 respectively.

The parties anticipate  entering into a modified Plan Support  Agreement,  under
which the Noteholders  would agree to support the  modifications  to the Plan as
summarized above.





----------------------------                        ----------------------------
CUSIP No.  36229U102            SCHEDULE 13D          Page 7 of 7 Pages
----------------------------                        ----------------------------

                                    Signature

     After  reasonable  inquiry and to the best of my  knowledge  and belief,  I
certify that the information  set forth in this statement is true,  complete and
correct.

     Dated: March 16, 2010

                                    /s/ Eric M. Ruttenberg
                                    ----------------------
                                    TINICUM LANTERN II L.L.C.,
                                    On its own behalf and
                                    as the General Partner of
                                    TINICUM CAPITAL PARTNERS II, L.P.
                                    By Eric M. Ruttenberg,
                                    Managing Member

                                    /s/ Terence M. O'Toole
                                    ----------------------
                                    Terence M. O'Toole

                                    /s/ Eric M. Ruttenberg
                                    ----------------------
                                    Eric M. Ruttenberg