I recently bought a small bench top Sanford Surface Grinder, model SG 48. I believe this is the smallest model they made at the time. It came withou t a motor or bracket for mounting the motor. Would any of you have a sense of how the motor should mount and what the RPM of the motor should be. Fr om the literature I downloaded it seems the motor mounted somehow on the ba ck of the machine, but there are no photos that I could find. Does the mot or move vertically with turning of the hand wheel? Any help would be great ly appreciated.