On Sun, 30 Aug 2009 11:38:27 -0700, jim wrote:
How feasible is a DIY repair?

Not too bad. A squirt of contact cleaner into them by whatever means is
worth a try. If that doesn't work, they're typically held together by
bent-over metal tabs on the bodies, and you can carefully take them apart,
clean directly, then reassemble.

If they're standard shafts, values and mountings (if direct on a PCB) or
there's room for some (screen) fly wires then you can always replace.

Even if the shafts are something oddball, you may be able to mate the
shafts from the damaged ones to a modern part.

The only time it gets really tricky is when the clearances are too tight
to get an off-the-shelf part in there (oscilloscopes are notorious for
this!) or the part's really oddball.

cheers

Jules