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           In the track
          shoe, each pin lug has a  3.308 inch diameter hole for pin
          placement.  The size and location of these holes are held to
          precise tolerances.
          The 3.308" holes are formed directly in the seven pin lugs by
          positioning sand cores in the mold.  
          With the holes produced
          by the sand cores, a simple two-step finish drill takes
          the holes to final dimensions and tolerances. 
        
          | Using
            cores in the casting eliminates an expensive, heavy boring operation on the seven
            pin lugs. |  |  |