My latest version of my wet tumbler using a "free" treadmill motor for the power. "Free" is sorta unintentionally misleading, I reckon. The motor was free, but I fried either the circuit board that would run it, or the inexpensive pulse width modulator needed to make it run. Since I have no way of testing what component was bad, I bought an SCR, a Bridge Rectifier, a circuit breaker, a different potentiometer for the SCR, and a project box from Amazon. I bought a used DC Choke on ebay. I'd hate for my wife to find out how much I spent on this gizzie, so I have no total cost for all the stuff I bought, but I'd estimate it to be somewhere around $100? Could've definitely been done cheaper with the original circuit board and PWM if I hadn't screwed up that pulse width modulator or the circuit board that came with the treadmill.

Many, many thanks to the ‪@dazecars‬ channel for all his really good videos on how to wire and use the treadmill motor.