Vintage 1986, trivial question about knobs.

[Tom Albano]

Just a quick question, I just purchased an incredible Smith vintage 1986 dovetail, Walnut body, birdseye center block, ebony board. The pots on this bass are super small and very thin, not standard sized pots. Does anyone have any experience with getting new knobs for these type of pots? As they are a bit loose and shaky and do not seem to tighten properly. Other than that, completely love the preamp and tone and neck and ....
Thanks