How the mirror is "glued" make a huge difference. Many mirrors just use foam tape.
We use stuff like this to bond metal and glass and the only way to get the stuff apart after is to destroy one of the two (keep that in mind if you like changing mirrors). Ever seen those glass tables with impossibly small contact areas for the legs and wonder why they don't come apart? UV cured glues are exceptionally strong.
http://www.glass1usa.com/UV-GLUE.htm
Mark
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.