| Concentric/Stacked, its all the same. They have the same leads as a regular pot, so its no harder to work into your bass. Concentric controls are pricey, though, expect to pay about 30 bucks for the pot and knobs.
Not sure what bass and how many holes you have to work with, but I would suggest replacing one of the knobs with a concentric and another with a push pull. The way my brain thinks, I would replace the volume with the push/pull and have that controll the on/off and replace one of the tones (mids probably) with the concentric, as you stated above.
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If you can't do-it-yourself, why do it?
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