I pulled mine off the shelf today to dust off the cobwebs. Much to my
chagrin I found the tuning capacitor almost frozen stuck. For those
that aren't familiar with the construction of these there's a lot of
nylon? bushings involved.

I suspect lubrication may be the culprit that causes the nylon to swell
up. I was finally able to get it loose enough to where the vernier
doesn't slip although it still feels very tight.

Too late for me to avoid lubrication but I thought I'd pass this along
for the next guy.

-Bill