I have some Ford Transits as rental vehicles at my U-Haul dealership and just had a customer bring one back saying the rearview mirror was loose. After I got the plastic piece behind the mirror off, I see the mirror bracket has come completely off the piece that is glued (?) to the windshield. I can see how the metal clip clips on to it, but I can't get it to attach. There is a small slot on one side which I tried to pry the clip back slightly to allow the mirror bracket to slide on, but couldn't really get that to work either. Is their a special tool or trick I am missing?