Re: Waiver of Voting Agreement

Exhibit 99.6

March 22, 2006

Mr. Fred W. Broling
Mr. Mark W. Mealy
Mr. Daryl R. Lindemann
Mr. Brian L. Geiger
Mr. Brian R. Doolittle
Mr. David M. Stratton
Mr. Robert J. Janeczko
Mr. Jerry Bates
Mr. Eric Johnson
Mr. Randy Wright
Mr. Paul Jagow
Mr. David Nicholson
Mr. Rodney Harrison
Mr. Thomas Lauerman
Mr. Dan Wabel

     Re:        Waiver of Voting Agreement

     Gentlemen:

     Reference is hereby made to that certain Agreement and Plan of Merger (the “ Merger Agreement ”), dated as of March 22, 2006, by and among Morton Industrial Group, Inc., a Georgia corporation (the “ Company ”), MMC Precision Holdings Corp., a Delaware corporation (“ Parent ”), and MMC Precision Merger Corp., a Georgia corporation and a wholly-owned subsidiary of Parent (“ Merger Sub ”), providing, among other things, for the acquisition of the Company by Parent, such acquisition to be accomplished through a merger of Merger Sub with and into the Company (the “ Merger ”), with the Company continuing as the surviving corporation and as a wholly owned subsidiary of Parent. Reference is also hereby made to that certain Voting Agreement (as amended, modified or supplemented from time to time, the “ Voting Agreement ”), dated as of January 20, 1998, pursuant to which each of you (collectively, the “ Other Shareholders ”) granted to the undersigned an irrevocab