Generally, the variable speed foot controls like you use on your flex
shaft work on “universal motors” and NOT on “AC induction” motors. If
the motor has carbon brushes, like a flex shaft motor, it should
work. It will also work on the Giles wax pens (set control to high,
use foot speed control to control heat). It will even work on a
regular table lamp (regular light bulb).
The Jewelry Equipment Dr.