There should be a small set screw on the side of the metal pad that tightens against the mirror to keep it from wobbling. It may be loose or missing. It takes a very small allen wrench to tighten the set screw. If tightening the screw doesn't stop the wobbling, you can loosen it far enough to slide the mirror up and out of the bracket. Slide the other mirror into the bracket and tighten the set screw.
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