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Convert your Thumler’s Model B tumbler to run 2 small barrels!
It’s quick and easy to convert the Thumler’s Model B rock tumbler from a large, 15-pound capacity tumbler into a tumbler that will run two 3-pound barrels. This modification will also let you run a 12-pound barrel on the Model B base. It’s like having three tumblers in one – Triple the possibilities!