RING GEAR to repair the main spindle Bull Wheel (the larger of the two gears on the main spindle). Machine off the damaged teeth and shrink or Loctite the new gear in place. Can be used on all belt-drive models the A, B, C, AUD, BUD, CUD, ME10, CSB and those T and TUD non-screwcutting lathes fitted with backgear - but not the VSL which had hardened backgears. PLEASE NOTE: this is a 14.5-degree gear, not the later 20-degree.