[Jack E/NJ]

In the olden days before HF, we used to call these ball mills. Usually made from the two rollers of discarded Maytag ringer washers at about the time when automatic spindriers became popular. Mount the rollers on a 2x4 with the original Maytag pillowblocks. Put a bunch of spark plugs, bolts or whatever into a paint can with some water, Rinso & fine sand. Then roll the can away. with the Maytag motot's output shaft positioned atop one of the rollers. I still do it this way today. But have to use Purex Ultra liquid detergent cuz Rinso's hard to find these days. 8^) Jack E/NJ