You can take the mirror apart and clean/ grease up the gearing. I used petroleum jelly (vasoline type) as a light lube. Clean the switch and connections too. Works rather well now. I found a small old wasp nest up in there when I cleaned it out.

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If it ain't broke take it apart and find out why.

1983 300SD, 4 speed
1994 C280
1987 300TD wagon
1996 HD Road King

Ride in Peace Eric Peterson, Harley of Macon