So mine in my SC would fall off alot using the rear view mirror glue because the hot ass sun and lots of bass from subwolfers aren't a good mix. So I put it back on last time with clear epoxy that was a few years ago still holding on... Now to get the button off (if I ever wanted to) would most likely break thr windshield but it's on there....
I wish Ford made them roof mounted in the first place, the glued on button reeks of cheap beancounters ideasMine has come off several times, I've found that the parts store glues just don't last. If you go to an auto glass shop they usually reapply the button for free (at least the glass pro by me does) and it usually lasts a couple years. I've been meaning to do what my buddy did, he got a different mirror completely. His is now mounted to the roof and hasn't had an issue in over 15 years, even when his stereo was hitting 156db+...