Scott,

This repair has been discussed on the list on numerous occasions. Tightening
the adjusting nut too much can cause the base of the mirror mount to crack.
Doing this to a mirror w/ a cracked base can only cause the crack to get
worse. Eventually the crack will be so bad that no amount of tightening will
correct the problem.

Then the only solution would be to replace the assembly. Or if appearance is
not critical, you can use a hose clamp to hold the cracked pieces together.

BenT
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