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Geez, what a nusance. It's a problem on about three of my Les Pauls right now; not to mention the football switch on one of my Strats p/u selector.
I know there's a simple fix before I make the problem worse.
What I do - is take a tooth pick... and coat the inside of the knob's hole with superglue.
DO NOT BE A DUMBASS AND PUT THE KNOB BACK ON BEFORE THE GLUE HAS DRIED COMPLETELY.
The superglue builds up material, makes the knob fit "like new". If you can SMELL teh superglue its not dry yet!!!
Sometimes ya need two or even three "coats", but it works fine, is clear, is a completely invisible fix. But it takes longer - you gotta let that knob set up overnight... or more for extra coats. But then again, you dont risk breaking a split shaft either.
Sounds like a lot of good ideas here but I've got one more easy one. I've fixed loose knobs by placing a small square of thin paper over the top of the pot shaft. The square of paper should be smaller than the diameter of the knob. Then I just push the knob on the shaft with the paper in between. It sort of forms the paper around the shaft for a tight fit. And best of all it's temporary but holds the knobs on snug.
What are you guys using to open up the split shaft a pry-bar!?!?
I've, over 25 years, NEVER broken a split shaft put. You take a small flat head screw driver and GENTLY open up the shaft a TINY bit. It takes VERY little to get the shaft to the right size for the knob.
Use the shaft for what it was designed for.....it is split for a reason! I'd never put gunk, tape, crap in the pot just to get it to fit!
It really depends on the composition of the metal of the pot's shaft. Can anyone comment the split shaft alloy of the various brands? Pot metal will fail without much coersion. Break a shaft and your simple project just became much more involved.