Top magnets:
  NEW TABLE: 1" long, 8/32 screws (except end 4 screws which are very short)
  OLD TABLE:
       NO Metal Magnet Shim: 1" long, 8/32 screws
      WITH Metal Magnet Shim: 1 1/8" long, 8/32 screws

Ball Bearings are 5/16" diameter