Rust removal, cleaning motorcycle gas tanks. Tumbler tumbling.

After my attempts to train pygmy marmosets to use miniature sandblasters inside motorcycle tanks failed miserably (boy, can those little buggers bite!), a week of tinkering yielded this contraption. It works like a charm, actually. A slight modification to a second one under construction will permit somewhat faster and smoother operation although there seems to be little advantage to exceeding 30 rpm or so. I’m using half a litre of varsol and a kilo or so of shattered tempered auto glass (wife’s idea). I h