Mr. Pinball Tip:

Electromechanical stepping wiper units usually are sticky because they are dirty, but sometimes the real problem is that someone bent all the wiper fingers to put too much pressure on the contacts. With all the fingers that most units have, this creates a tremendous amount of friction that must be overcome. Proper lubrication with coin-op lube helps, but may not overcome the pressure. Check the pressure of each finger. If it has much more than is required to provide only a little contact pressure, loosen it up using a contact adjustment tool. You'll have to play with this a few times to figure out how much pressure is too much.
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