I recently had to make a trip to the US. Usually on my way back to an airport I stop off at a Horror Fright store and top up my luggage allowance. However, past trips had pretty much exhausted my needs of stuff small enough for luggage and so I bought one of these
https://www.harborfreight.com/5-lb-m...ler-67617.html

and https://www.harborfreight.com/540-lb...dia-63673.html

and https://www.harborfreight.com/520-lb...dia-63672.html

I also tried some sharp sand and some glass beads.

I feel that I had wasted my money. It is useless. Against the wisdom of the instructions I tried the bought media with water. That worked a little better but still very poorly.

I am seeking suggestions for improvement. Mods to the machine or different media.

PS. A while back I built a very Q&D rotating tumbler using a 75 rpm motor and gearbox from an old photocopier and that works so much better.

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