I got so sick and tired of mine vibrating, to the point where it was hard to tell the make of the car behind me, that I tried a few things.
First off I installed a small rubber o-ring in the grove on the top pin. This stiffened the main mounting point and did remove some of the vibrations. The main source of the vibrations comes from the fact that the spring clips are too soft, and deform easily. You can bend them back into shape, but when you install them again they deform just enough to allow the mirror to move slightly. The front attach point seems to be the main culprit.
Finally I decided that the only way I was going to tighten things up was to pull the lower front part of the housing tight against the tupperware. I drilled a small slot in the black portion of the mirror and the body flange just behind the mirror so that I could run a black ty-rap through the slots as I install the mirror. I then use the retainer end of a second ty-rap to tighten the mirror against the body panel. Once the mirror is secured, I cut the remaining tang off.
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