tone & volume knobs/pots spin too easily

Depends on how the pot is constructed. If it's a CTS or other where the bottom has 4 tabs bent around to hold it together, you can pinch those tabs down with pliers and it will tighen the pot. Otherwise, you need to replace them.

 

Replacing the knob will not help.
I've seen a few guys cut out pieces of felt shaped like a washer and sandwich this between the knob and the top of the body. This adds a little friction to the underside of the knob.
Even the right diameter o-ring in there would work too.
Saves you having to do any wiring and replacing parts.

Ron

 

I use the O-ring trick on the volume pot of my Parker works like a charm.

 

I've heard of winding a small rubber band around to add friction.

 

i used a very thin rubber washer under the volume knob on my steinberger. it would gradually turn itself down.

 

I forgot all about that felt washer trick. If you want to give that one try, the felt replacement pads for trumpet valves work well (no cutting required).