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Screech comes from 2 shiny ultra-smooth metallic surfaces rubbing past each other. I know it sounds slightly blasphemic to do but unscrew the barrel from the body so you don't contaminate the lens and using very fine wet & dry ( 400-600 ) lighty dress the barrel outer surface so it gets a slightly satin finish. This will break the intimate contact on a micro scale. Alcohol clean it before re-assembly.
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