A heaping big "Thanks!" to everyone for all the great input and
instructions.  I went ahead and pulled the mirrors off tonight, cleaned them
well, filed the inner ball joints a bit, tightened, and re-mounted.

OK, so I only re-mounted the driver's side mirror.  Despite the numerous
warnings, I tightened a bit too much on the passenger-side mirror so I can
now say from experience that these babies are not indestructible.  I don't
think I used any more torque than I had on the driver's side, but I sure
busted the nut clean off.  So I get to check out the parts dept. of a local
VW dealer on my lunch break tomorrow...

Thanks again to all for the many helpful responses.  This has got to be one
of the most active and helpful lists I've ever seen.  Very nice thing going
on here and I'm glad to be part of it!

Jim
1986 GL Camper