I think it is.@bayou5252 - My model B tumbler is not the high speed model. Can it be converted by putting a larger wheel on the motor or do I need a high speed motor?
Al Model B tumblers are designed and sold as a reloading/brass cleaning tool. Original equipment is the 3000 rpm motor.All model B tumblers are *not* the same. There are high speed and low speed versions. The high speed uses a 3000 RPM motor, the low speed a 1550 RPM. For reloading (brass cleaning) purposes the high speed is better suited. Rock tumbling and polishing works better with the low speed version.
The following link shows two replacement motors for the model B:
<http://rocktumbler.com/thumlers/model-b-tumbler-parts.shtml>
Ordering the high speed motor would be the preferred way to convert the tumbler.