Skeet zone, campercar, hotzfamily, alimen: thanks for the responses--all of these make a lot of sense. I will go ahead and buy the cover that strat56 mentioned even though I got a good seal with the o ring. I do think it is smart to keep the jack covered regardless of the method.
Davidl1957, the broken pieces I took out of the motor were between the magnets and appeared to be a guide for the three inch long screws that hold the caps on the motor. Very thin metal with a u shape to channel the screw. Should I be concerned? The motor works fine now.
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