Exhibit 4.3


                        FIRST AMENDMENT TO LOAN AGREEMENT


     THIS  FIRST  AMENDMENT  TO  LOAN  AGREEMENT  (this  "Agreement")  made  and
delivered  this 1st day of August,  2003, by and between  TECSTAR  MANUFACTURING
CANADA LIMITED (the "Company") and COMERICA BANK, a Michigan banking corporation
and  foreign  bank  under the Bank Act  (Canada)  through  its  Canadian  Branch
carrying on business under the name Comerica Bank, Canadian Branch (the "Bank").

                                   WITNESSETH:

     WHEREAS,  the Company and the Bank entered into that certain Loan Agreement
dated April 30, 2003 (the "Loan Agreement");

     WHEREAS,  the  Company  and the Bank  desire to amend the terms of the Loan
Agreement pursuant to the terms and conditions set forth below.

     NOW,  THEREFORE,  in  consideration  of the premises  above set forth,  the
covenants,  promises and  agreements  hereinafter  described  and other good and
valuable  consideration,  the  receipt  and  sufficiency  of  which  are  hereby
acknowledged,  the Company and the Bank agree that the Loan Agreement is amended
as follows:

     1. The  defintion  of Revolving  Maturity  Date set forth in Section 1.1 is
amended to read as follows:

          "Revolving Maturity Date" shall mean October 1, 2004."

     2.  Section  9.11 of the  Agreement  is amended to read in its  entirety as
follows:

          "The Borrower  shall  maintain  at all times on a combined  basis with
               Tecstar:

          (a)  A ratio of Total Debt to Tangible  Net Worth of not more than the
               following amounts during the periods specified below:

                  December 31, 2002 through September 29, 2003       10.0 to 1.0
                  September 30, 2003 through March 30, 2004           6.0 to 1.0
                  March 31, 2004 and thereafter                       5.0 to 1.0

          (b)  A  Tangible  Net  Worth of not less  than the  following  amounts
               during the periods specified below:

                  December 31, 2002 through March 30, 2003          $1,000,000
                  March 31, 2003 through June 29, 2003              $1,500,000
                  June 30, 2003 through September 29, 2003          $2,000,000
                  September 30, 2003 through December 30, 2003      $2,500,000
                  December 31, 2003 through March 30, 2004          $2,750,000
                  March 31, 2004 through June 29, 2004              $3,000,000
                  June 30, 2004 through September 29, 2004          $3,250,000
                  September 30, 2004 and thereafter                 $3,500,000

          (c)  Working Capital of not less than the following amounts during the
               periods specified below:

                  December 31, 2002 through March 30, 2003          ($2,500,000)
                  March 31, 2003 through June 29, 2003              ($2,250,000)
                  June 30, 2003 through September 29, 2003          ($2,000,000)
                  September 30, 2003 through December 30, 2003      ($1,750,000)
                  December 31, 2003 through March 30, 2004          ($1,500,000)
                  March 31, 2004 through June 29, 2004              ($1,250,000)
                  June 30, 2004 through September 29, 2004          ($1,000,000)
                  September 30, 2004 and thereafter                 ($750,000)"


     3. All representations,  warranties,  promises,  covenants, or undertakings
expressly  or  impliedly  made by the Company in the Loan  Agreement  are hereby
expressly ratified and confirmed as of the date hereof.

     4. Except to the extent expressly modified by this Agreement, all terms and
conditions of the Loan Agreement shall remain in full force and effect,  and the
Bank reserves unto itself all rights and privileges granted thereunder.

     5. Company  agrees to pay all expenses  incurred by the Bank in  connection
with this  Amendment,  including  but not  limited  to the  costs of the  Bank's
outside legal counsel.

     6. Company hereby waives,  discharges,  and forever  releases Bank,  Bank's
employees, officers, directors, attorneys, stockholders, successors and assigns,
from and of any and all claims, causes of action, allegations or assertions that
Company  has or may have had at any time up through  and  including  the date of
this First  Amendment to Loan  Agreement,  against any or all of the  foregoing,
regardless  of  whether  any such  claims,  causes  of  action,  allegations  or
assertions  are known to Company or whether any such  claims,  causes of action,
allegations  or assertions  arose as a result of Bank's  actions or omissions in
connection with the Loan Agreement, any amendments, extensions, or modifications
thereto, or Bank's administration of the Indebtedness.

     7. This Amendment  shall be effective upon execution  hereof by Company and
Bank and execution by Tecstar, LLC of the attached Acknowledgment.


     IN WITNESS  WHEREOF,  the parties hereto have executed this FIRST AMENDMENT
TO LOAN AGREEMENT as of the day and year first above written.


                                COMERICA BANK,
                                CANADA BRANCH



                                By: /s/ Michael H. Cliff
                                   ---------------------------------------------
                                    Michael H. Cliff


                                Its: Vice President
                                    --------------------------------------------



                                TECSTAR MANUFACTURING
                                CANADA LIMITED



                                By: /s/ Michael H. Schoeffler
                                   ---------------------------------------------

                                Its: President and Chief Operating Officer
                                    --------------------------------------------


                                 ACKNOWLEDGMENT


     The undersigned  executed and delivered to the Bank a Guaranty dated August
1, 2003. The undersigned  acknowledges the foregoing Amendment and confirms that
its obligations under the Guaranty remain in full force and effect subject to no
defense, setoff or counterclaim.



                                TECSTAR, LLC


                                By: /s/ Michael H. Schoeffler
                                   ---------------------------------------------

                                Its: President and Chief Operating Officer
                                    --------------------------------------------