On 10/21/10, Ken Wilford <kenwilfy@comcast.net> wrote:
> ...Clean the points inside with some sand paper and you
> should be good to go.

When mine got balky (even blew a fuse) I just pulled the knob and
sprayed a bit of this in near the shaft:

http://www.radioshack.com/product/index.jsp?productId=2103700

... then worked the knob rapidly through the positions several times.
Worked and has continued to work since (so far).  Maybe I just got
lucky but easy enough to try before doing surgery.

Geo

BTW -- I had that stuff because it was what I used on the AFM track.