| The
      failure analysis of the original failed track shoes showed that there was
      solidification shrinkage and porosity deep in the body of the track
      shoe in the center web section.  
       Solidification modeling by ME Elecmetal confirmed the potential for shrinkage in this area.  When the first
      prototype casting was produced in the original design and then inspected, the prototype had the same shrinkage
      problem in the center web section.
     |