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What size volume and tone knobs for a Rondo SX bass?

On my "Vintage Series" Precision style, they are 6mm split shaft. But check yours to verify. In a recent thread on truss rod wrench sizes, we discovered quite a bit of variation. I have two SX basses with different size truss rod wrenches.
 
The OP posted What size volume and tone knobs for a Rondo SX bass?, so I'm guessing knobs, not pots.

The inside diameter for a knob shaft is for the most part universal. Not sure about "upgrading" knobs anyway. Speed knobs? Chrome dome knobs? Skull knobs with LED eyes? :confused:

OTOH, replacing the cheapo mini pots that SX ships with is a pretty common "upgrade".

It would be helpful to those of us trying to be helpful if the OP clarified what they're asking for.