Dry Vibrator?

It seems like this subject has been done to death. "Dry" tumblers are made for metal finishing (castings, bullet casings, etc.). They cost less generally because they have thinner bowls and lighter duty motors. Raytech may use a different counterweight as well as their rock tumblers are listed as "not for metal finishing". You might get away using it with light loads and Diamond Pacific's Vibradry compounds. Generally the dry tumblers run about 2/3 the cost of a rock tumbler so you won't save much. You won't save anything if it doesn't do what you want. I'd buy a used rock tumbler before buying a new "dry" tumbler if cost is a factor.