Thumler's Tumbler is the rock tumbling brand of Tru-Square Metal Products, a small metal shop in Auburn, Washington. The machines have been built there since 1960, and the name comes from the Thumler family who designed the first ones. The line is small and stable: the MP-1 and Model T for beginners, the 3 lb A-R1, the double barrel A-R2, the 12 lb Model B, plus the Ultra-Vibe UV-10 and UV-18 vibratory bowls used for brass cases and deburring metal.
The company suits people who want a machine to outlive the hobby: barrels, lids, belts and grits are sold separately for years after purchase, so a tumbler from the 1970s can still be repaired. Buyers looking for digital timers, speed dials or a slick shopping experience will be disappointed. Sales run mostly through hobby dealers and lapidary shops rather than the plant itself.
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