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Even if bakelite does shrink (which I doubt) it's certainly not going to flex no matter what you do to it. It's a hard material with almost no give.
Assuming your pot shafts are not damaged... ie, gouged or mushroomed (which might be very hard to see with the naked eye) filing away some of the inside of the knob is probably the only option. Have you tried all the knobs on all the shafts? Have you tried grease?
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