I am considering installing a new rear view mirror to replace the big black factory version. I quite fancy the one that can move up and down on a stalk. However before proceeding I have had a look at the fixing of the current mirror and I cannot see how to easily remove the metal fixing that is stuck to the glass. The mirror itself came of easily. I don't fancy getting too aggressive with it for fear of breaking the windscreen, but I can't be the first person to try this. Any tips gratefully appreciated.