I didn’t invent it, but im probably one of a few using a parts-tumbler to clean small car parts. But what is it? I often get asked how to use the procedure properly, so here’s a little description. 1. ABOUT I first came across this procedure when i was looking for a procedure to clean all those special-bolts on the Z, that cannot just be easy replaced with a standard screw. I found Mr. Maurers Ford Model A Restauration website, describing the procedure (german). see here: https://www.maurer-markus.ch/ford_a/tipps_vibrations_tumbler.html The Case tumbler aka Stone tumbler, Spirator, Vibrator, Deburr, etc., can be used for various things, but the main reason i know is…