Older polisher modification

if you go to a hobby shop you can buy a decent rheostat that has a cord, plug and led on it for about $20, i use 1 on the fan of my gas fireplace and got one in the shop to control temperature of soldering irons and grinders that have no speed control built in, i built 1 ,by the time you buy dimmer switch, electric box ,plug and cord , you will be close on price ,and the rheostat you buy are not near as bulky