I now have two US P-basses. I've always been aware that the older one has slightly wobbly pot knobs, but having bought a new US P I am even more aware of how wobbly they are compared to my new one where the knobs turn with a really nice action. On the new one there is a small amount of resistance as you turn them, they don't wobble, and they feel really solid. On my older one they move with very little resistance, and you can practically rattle them.
Is this just a question of age and use, or can the old ones be fettled to be a bit more solid? They're not moving in the scratchplate, so it's like it's the pots themselves, if that makes sense.
Any ideas / input would be really gratefully received.
Thanks!