This is a video of a Lot O Tumbler in action.  The Rock Shed in Keystone, South Dakota posted this on You Tube.  They are tumbling a batch of Tee Pee Canyon Agate.  Tee Pee Canyon Agate is becoming harder to find and is almost as valued as Fairburne Agate.  Tee Pee Canyon Agate is native to the Black Hills.  

The tumbler has sticky strips so the machine can be mounted on a study block, silo stave, or solid cement floor.  It is relatively quiet, we have sound proofed a little before with a strategic placement of a towel.  The action of the Lot O Tumbler is caused by weights that are placed in the rotary cooling wheels and put in synch with each other.  Amakingly powerful for a 1/10 hp electric motor!  They are using big ceramic filler.  I use smaller pettets, as I feel they can get into difficult areas on the rock.