I have a Skil 3380 bench grinder that hums at startup. There are 2 capacitors.
One is about 2 1/4" tall by 1" diameter in size 300v 12 micro farads. The other is soldered on a small board that contain the wires for the lights and 2 blue wires that go to the stator windings. It is 1" by 3/8"...