I put a small piece of black electrical tape on the back of the glass, over the bubble, on my MR-67 tuner and can't tell it's there anymore. Or else you can order a new glass faceplate from Audio Classics for about $100.
But I should say, the bubble was in the black part of my faceplate! I don't know what your C22 looks like. If it's clear, why not a piece of regular clear cellophane tape?
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