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Old 11-28-19, 09:02 PM
Andrew R Stewart 
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My only comment might not even apply, the OP's description is so lacking I'm not really sure what is going on. BUT, a 3mm increase of fastener diameter (from .5cm to .8cm) is a HUGE increase in both diameter and, I assume, thread pitch. Generally when one tries a larger fastener in a stripped out mount it's typical to go up only one size of bolt/fastener. Not 3 sizes. Andy (Who's wondering what really is going on. Another reason to post photos or a link to a photo sharing site.)
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