Contact Muth Mirrors and explain your problem to them. They will send you a new foam donut to go under the mirrors which will stop the vibrating. No cost! At least that was how it was in the past for mine.
At one time they did vibrate and Muth sent out a "fix" where you applied a double backed foam tape "ring" under the round holder where they clamp on. That does stop the rattleing. I broke one of my mirrors and when they sent the new one, it had been updated and did not rattle. It's a simple fix....as long as you don't break the mirror trying to get it off. That's the tricky part.
Joe, Be sure they are securely in place. I had one that vibrated like yours, so I contacted Muth. They sent out a replacement and when I removed the original mirror, I noticed the PO had not seated it completely. I popped it in all the way and no more vibration.
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