The Mirror is held in there by its black plastic bezel, or frame. I had to replace my glass, and found an exact replacement on ebay for $29, shipped. (Part 709748 by Velvac.) Anyway, I moved the mirror max left, then down then right then up, releasing the barbs as I went around. I used some needle nose pliers, to pinch the plastic barbs a little, and a putty knife to push or pry the bezel off. Be careful not to break any barbs. The job was actually quite easy. Once you are in there, you can see what is going on. I assume you know about the white plastic plug on the end of the swing arm. It covers up a set screw used to tighten down the post for the whole mirror assembly. I hope yours is an easy fix for you. Good luck.