If you have an old tumbler that still works don't waste you money on a newer chinese made thing that is going to do the same thing. They turn a drum with coins in it, that's all you need.
You can probably go on ebay and get a brand new belt for your old tumbler for a few dollars and be good to go for years. Heck I spent a little extra and got an old school Thumler's Tumbler just because it isn't newly made junk.
http://www.ebay.com/sch/i.html?_odk....TRS0&_nkw=Rapco+tumble+stones+parts&_sacat=0
That link looks like the one I have all this one needs is a new BIG rubber band or sleeve to go around the tumbler. It will do the job but it is load and takes forever I can maybe get a hand full of coins in it. I guess I could use it and save some $$$. I was keeping this for my toy collection (have certain toys, games saved from my dad's childhood all the way to about 2000 when my kids stopped getting toys lol) but .....
Still curious, what is better the vibration or tumbling? Anyone use the UV cleaners?