dont waste you money on rear veiw mirror glue. use crazy glue.

take a razor blade and scrap off all the glue from the widshield, and the silver button on the mirror arm. the take the metal button off the mirror. and put the glue on the button, make sure its the right way, and then put it back where it was, hold it in place till the glue sets. the important part is, leave the mirror off for 24 hours, then re install it.

i knocked mine off a few months ago, and its still up there, in all this heat ive been having.