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DO NOT leave it that way - that fuse is for YOUR protection, and the protection of your family and neighbors.
That humming is probably an byproduct of the speed control, not too much to worry about. The vibration should go away almost entirely when you reset the wheels to run true and dress them to balance.
The capacitor is your starting capacitor - its voltage rating is completely unimportant - that's a max voltage rating, and they only wanted to stock one capacitor, not have one for the 120V versions and a second one for the 240V versions.
Did you by chance start working on this grinder while it was still under warranty?
If the wheels turn freely when the power's off, and if the grinder doesn't get awfully warm when it's in use, then I'd think that the problem is within the speed control board.
Unless the motor is a brush type universal unit, there is commonly no way to change the speed of an induction motor. There are AC motor speed control units available, but cost more than the grinder as they change the frequency as well as the voltage. There are speed controllable grinders available that use brushes so that simple electronics can control speed. Hope this helps!
You are correct, there is no replacement for part # OR90357, but if you have the original motor, I am sure that a local electric motor repair shop will be able to repair, or replace it. I'm confident that this is your best option at this point.
If it is under warranty, take it back. If not then it is a simple matter of replacing the switch. Take off the cover and pull out the switch. Mark each wire as you take it off. Take the switch with you to the store. First try a hardware store, then an auto parts store. If they don't have it try Sears. They will probably be able order it. Make sure you have the model number of your grinder. It is on a data plate somewhere on the grinder. If Sears can't get it, try a wholesale electrical parts house.
The motor and grinder pulleys need to be perfectly parallel or the belt will track to one side or the other. The belt must be uniform with no stretch or wear points which will cause erratic travel. Hope this helps!