I have a broken mounting tab on my driver side mirror. Attempted repair with JB Weld only to have it break immediately upon closing my door: waste of 12 hours. Options were to buy an OEM replacement for $50 or a billet aluminum one for $80 since the nearest junk yard is an hour drive--hell no. I saw on a forum that someone had carefully drilled holes and used safety wire to reconnect the broken pieces. I went even easier: there are already screws in the mirror mount, so why not use them?
I bought some safety wire at Harbor Freight for $1, took off the affected mirror, wrapped the wire around one bottom screw, around the mount to the top screw and around it once, then down to the other bottom screw and around it. I had to do this with the mount installed on the mirror housing to get the wrapping inside, but it works great! Mirror isn't bouncing or about to fall off anymore and it's actually usable while driving. Just make sure to pull the wire tight as you wrap.
Total cost of $1+tax and about 20 minutes of time. It's been on there a week with no issues. And even if it fails after some time, I've got a ton of wire left.
Pics of the fix
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