Yesterday I busted a tooth off of the bull gear. Unfortunately it was right next to a tooth that was missing when I bought the lathe. From what I can tell I am more likely to win the lottery than find a good condition bull gear. I read up on some methods of repairing it but none of them really inspired me with confidence. I really don't like the idea of trying to thread things without the back gear. I am considering adding a VFD/3-phase motor to use in place of the back gear. I understand about being down on power at lower speeds, but on the back gear I am usually just threading which should require lots of grunt. Are there any other drawback anyone can think of? Or, am I wrong about not being able to find a bull gear?