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I made ine from a 1ltr Coffee tin and glued/riveted some paddles to agitate the brass.

I reckon a big container of protein shake stuff would work well. My tin works well, but theres a lip on it...

https://youtube.com/watch?v=9bXLq_9CW4c

Im seriously thinking about making my own Rangi case tumbler. Decided to search on Youtube and a aussie guy made one exactly like i was thinking from a windscreen wiper motor, looked sweet.

Is there any reason for tumbling other than to have shiny brass?
Does the cleaning of the inside make reloads more acurate or more consistent? Does the clean inside give less wear on seating dies?