Exhibit 3 AMENDMENT TO VOTING TRUST AGREEMENT Pursuant to Section 5 of the Voting Trust Agreement ("Agreement") dated December 29, 1992 by and between Sheldon B. Lubar, Marianne Lubar, David J. Lubar, Kristine L. Thomson, Susan L. Solvang and Joan P....

                                                                    Exhibit 3

                       AMENDMENT TO VOTING TRUST AGREEMENT


             Pursuant to Section 5 of the Voting Trust Agreement
   ("Agreement") dated December 29, 1992 by and between Xxxxxxx X. Xxxxx,
   Xxxxxxxx Xxxxx, Xxxxx X. Xxxxx, Xxxxxxxx X. Xxxxxxx, Xxxxx X. Solvang and
   Xxxx X. Xxxxx, as depositors ("Depositors") and Xxxxxxx X. Xxxxx, as
   trustee ("Trustee"), the undersigned Depositors and Trustee hereby amend
   the last sentence of Section 3.01 of the Agreement to read in its entirety
   as follows:

             "Notwithstanding the foregoing, after six years from
             the date hereof, the Trustee may not sell the stock
             without the approval of the beneficial owner."

             Dated December 12, 1997.


   DEPOSITORS:                             TRUSTEE:


   /s/  Xxxxx X. Xxxxx                     /s/  Xxxxxxx X. Xxxxx             
   Xxxxx X. Xxxxx                          Xxxxxxx X. Xxxxx

   /s/  Xxxxxxxx Xxxxx           
   Xxxxxxxx Xxxxx

   /s/  Xxxx X. Xxxxx                 
   Xxxx X. Xxxxx

   /s/  Xxxxxxxx X. Xxxxxxx           
   Xxxxxxxx X. Xxxxxxx

   /s/  Xxxxx X. Solvang              
   Xxxxx X. Solvang

   /s/  Xxxxxxx X. Xxxxx              
   Xxxxxxx X. Xxxxx