OK, after ten years in and out of the same driveway, I finally managed to find the garage with my mirror. The mirror lost. Housing damaged, totally loosened/broke something inside, support arm not at ...
Sounds like the shear bolt broke as it is designed to do so the arm and body aren't damaged. You can put a bolt up thru it but the risk is next time its hit it will damage the arm. cause it won't snap off. I eventually replaced it with a new one. I did replace a lower mirror once too.