Do any of you guys tumble coins AND rocks??? I bought my 7 year old a Harbor Freight tumbler, and he loves doing ricks. I need to do a batch or 2 of clad, but don't want to ruin the tumbler barrel. Can I go back and forth between coins and rocks?
You're worried that coins will damage the tumbler, but rocks won't?
You can go back and forth just fine. In fact, for modern clad, you might consider running both at the same time, pull the clad after a few hours, then run the rocks to finish.