I ruined a Lyman vibrator tumbler and replaced it with a Harbor Freight version. It was far cheaper, and so has lasted far longer.
For media, I get the cheap reptile bedding at the pet store. I believe it is called Lizard Litter. It's almost the same thing as brand name crushed walnut, maybe a little coarser.
I have friends who paid quality money for Thumbler rotary tumblers and are having great success with stainless steel pins!! Photos I've seen look like new brass. Too pricy for me though.
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