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I'm pretty sure bakelite don't shrink though some other plastics do.
If it is half round sanding the shaft may be the best option. If solid core round with set screw you may be able to gently drill out the knob with a bit a hair bigger (I did this with a metal knob once), if it is slotted core full round shaft pinch the halves together till it fits...If that don't work drill.
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