Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>" <Teslamagnifier-at-aol-dot-com> You can find inexpensive 6" bench grinders around 20-30 bucks. rpm is 3400, grind two flats on the rotor and can get up to 3600 for synch. Bill Shepard Thats what I read, and am about to try it.