I kinda figured it would be hard to find a replacement part so I’m working on repairing my old one. The problem it that it broke into 3 pieces so I’m not sure how long it will last. Yes it the spindle drive pulley, I got this lathe giving to me from a local company after they broke it. I’m hoping I can fix it, I hate to see old stuff like this scarped, the rest of the lathe is in really good shape. Thanks for the reply’s.