First things first, head on down to your local Autozone or whatever and buy yourself a new interior rearview mirror $12.95, next take it home and Remove the mirror from the packaging and smash it
Remove retaining screw from rear view mirror retaining bracket and remove two screws from the back of the TT backing plate and remove the swivel arm, save the little screws, after removing the swivel arm remove the 4 tabs that hold the swivel ball, at first I was just going to bend the tabs over but in the last step I found that the cover would fit so they had to come off
Cut the ball off of the suction cup arm and remove the cover
Drill 5/32 inch hole in the TT back plate
Slip the cover over the rear view arm, it maybe tight but it will stretch a little
Put it all back together again
It took about 30 minutes, once you take apart the mirror and the back plate of TomTom you will get the idea
Remove retaining screw from rear view mirror retaining bracket and remove two screws from the back of the TT backing plate and remove the swivel arm, save the little screws, after removing the swivel arm remove the 4 tabs that hold the swivel ball, at first I was just going to bend the tabs over but in the last step I found that the cover would fit so they had to come off
Cut the ball off of the suction cup arm and remove the cover
Drill 5/32 inch hole in the TT back plate
Slip the cover over the rear view arm, it maybe tight but it will stretch a little
Put it all back together again
It took about 30 minutes, once you take apart the mirror and the back plate of TomTom you will get the idea