Conversion Kits for mini lathes & mini mills. Bed extensions, change gears, metric threading, air spring kits and more at LittleMachineShop. Search term (800) 981 9663 (800) 981 9663; ... This kit converts a Grizzly or Micro-Mark mini mill to an R8 spindle; $84.38: More products like this: Spindle Lock, Interlocked, HiTorque Mini Mill ...