Passenger side mirror will stay adjusted

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Sep 12, 2015
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SW Ontario
My Car
1971 Mustang Mach 1, M code, 4 speed.
Passenger side mirror will stay adjusted. Shut the door or hit a bump and it goes out of adjustment.
I have tried googling but seem to find buy or replace.
Any way to tighten?
Yes, I had this problem which is very common. My "fix" was to revert to my fave go-to product, Black Automotive GOOP. This is a rubbery like sealer/adhesive which stays somewhat flexible. I added a small bead at the ball socket at the back of the mirror base, set the mirror where I needed it and used masking tape to hold it there until the GOOP set. This has worked for about 5 years now. Oh, don't forget to thoroughly clean the area with brake clean or similar.
It's worth a try at least.