anybody using ball bearings for a magnablock to ride around on ? if so, how difficult is it to continually maintain control of the ball and simultaneously rotate. i'm using a grs turn table, but wondered if it is useful to add a ring on top of the table and load it with ball bearings. i use push graving, gravermeister, airgraver, and sometimes hammer & chisel. i know the balls would have to be removed for h & c.