Loose pot knob on shaft

Setup, repair and restoration of Rickenbacker Instruments

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Loose pot knob on shaft

Postby (scoobster28) » Fri Sep 28, 2018 6:06 pm

My "blend" knob on my Rickenbacker is loose. I haven't used it much, so it isn't worn from use. The knob pulled off easy, and I could see the set screw screwed in and out like normal (so I don't think the knob's threads are stripped). But, when I put it back on the know I cannot tighten the set screw enough to prevent it from spinning on the shaft. The shaft don't have a flat portion for the screw to bite into, and aside from a slight bump is practically smooth all around.

Any ideas?

(Snarky ones like "you don't need that knob anyway"... while true... aren't that useful!)
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Re: Loose pot knob on shaft

Postby (jps) » Fri Sep 28, 2018 10:42 pm

The knob's threads may not be stripped enough when there is no torque on the screw until it is tightened onto the pot's shaft. Otherwise, I can't think of any other reason it won't hold in place on the pot. No need for a flat spot on the shaft although you could add one if done carefully.
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