I’ve since experimented with stainless steel shot in my latest vibrator. It polishes and deburrs (rounds sharp edges) nicely. The hard part was separating the non-magnetic shiny shot from the same-size shiny metal pieces. A flat tray helped a lot.

Also, the abrasive media picks up plastic from the cheap barrel of my latest tumbler. I had to run the now-shiny media in my old vibrator for a while to grind the soft goo off, to prepare them for another polishing run. There is a reason this last one is so cheap: Wrong resin barrel for my needs.

I may try putting shredded paper in with my next run, in order to keep the media cleaner. Then I’ll report how that works.