Rotating DON Bezel of a vintage Speedmaster

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Obviously the answer is to screw it down tighter. 😉
 
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No, the G-S cement is somewhat rubbery, designed to set G-S crystals. Plenty strong but removing the bezel with the correct tools is easy.
 
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Okay, I’m puzzled: if the bezel is loose, you punch on the inside of “B”? Is the idea to decrease the diameter for a snugger fit, or get it tighter via other means?
The idea is to create small dents on 8 positions in order to tight a bit the diameter around the bezel => with the proper tool and when it's done correctly it is almost invisible.