so I'm guessing your speculation is based on the side views of the blend and treble knobs which are closer to the body whereas the vol and bass knobs are more floatings which the nuts are visible under the knobs?I haven't taken the knobs off but I am speculating that for the volume and bass pots, the nuts are fastened to the face of the bass while the blend and treble pots have nuts fastened to bottom of the wiring cavity on the reverse side of the instrument. Get it?
I've no idea if such potentiometer which doesn't require to be fastened from the outside existed.
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