Headlight grinding

I have an 1987 Formula Firebird, and recently the right headlight motor keeps running for a short time after the light is fully up or down. Is there a limit or overcurrent switch that is in line? This
only occurs on the right headlight. The motor on the left stops as soon as the motor reaches the fully up or down position.
TIA Carl
1987 Formula Firebird, 5.0 TPI 5 speed manual
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this motor is sealed:
All the stops are internal, from what I remember. There are only a few adjustments in the outside, it sounds like the bevel gear has worn, and the worm gear slips a bit after the linkage hits the stops.
Maybe time for a new one, unless parts are available.
Time to PING the man: bigfig, he's the resident genius on parts and subassemblies.
I hope this helps?
Refinish King

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King:
See other post by Bruce. This is a common problem that the aftermarket, not the OEM has fixed with inguenity.
As I recall, GM will make you buy the whole ball of wax when the old parts can easily be replaced/repaired.
Joe--ASE Certified Parts Specialist & 10th Ann.Club Tech Director '80 Carousel Red Turbo T/A, 27k orig. '79 "Y89" 400/4 speed 10th Ann. T/A, 57k orig '84 Olds 88 Royale Bgm 2 dr, 307 "Rocket" (lol), 143k and still going.... '91 S10 Blazer 4.3Z
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Thanks Joe:
Refinish King

not the

can
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The balls inside the motor have finally given and now become a fine dust. You'll need to get new internal bumpers. I bought them here:
http://www.rodneydickman.com/n22.html
Worked fine on both my headlights.
-Bruce
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