That's interesting. I went to a vibratory tumbler years ago and don't use my Thumbler's much any more, but when it was in regular use (before anyone even made the other kind), I would get bits of rubber dropping onto the frame under the belt. I never knew why and never had to replace the belt, but I'm guessing it was due to the slippage you describe.
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NRA Certified Instructor: Rifle, Pistol, Shotgun, PPIH, Metallic & Shotgun Shell Reloading; RSO
Pemigewasset Valley Fish & Game Club
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