The 3 phase motor on my Jones and Shipman 310 went *puff* this morning and the room filled with smoke. Not good. How special are grinder motors? Some sources will tell you that they're precision balanced and a standard motor won't do. I'm always suspcious of such claims since it's an electric motor that drives through a long flat belt and sit's under a ton of grinder. Do I need a special motor or will a foot mounted motor do the job?