I'm working on an idea to rig up some signal mirrors. I'm using a damaged side mirror I replaced when I 1st got the car to practice on. I removed all the screws I could see but still can't get the mechanism out. Is there some secret to removing the mirror out of the front? This seems to be the only way to get at the guts. I tried to pry it but didn't use too much force so as not to break it, thinking there's maybe another way I'm overlooking...