I'm looking for information on repair of a magnetic chuck on a Blanchard Grinder. My first visit to repair it the issue was it would come on when you turned it on but it wouldn't always cut of when you cut it off. Now the end user says it doesn't come on either. When you have it on and look in the electrical cabinet you can see a small motor running with an adjustment knob under it. Behind the motor you can see a large contactor that is slowly moves in and out . I'm not sure its supposed to be doing that . The brand of the chuck is Electro matic. I cant get any support out of them since its so old. Where do I begin with trying to get this thing to work properly?