First thing I'd do is pull the cover & blow them out good. Inspect the diaphragms where they touch the electromagnets for corrosion. Beyond that I'd have to look in Hemmings for a rebuilder. Someone else may have more info.
Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.
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