Thought I'd revive this thread......
I've noticed on my Roadster that my mirrors start vibrating at around 2800 RPM's the left mirror is worse than the right, if I put my hand out and touch the tip of the teardrop mirror it stops. I've tried removing the mirrors and reseating the crush washers, but it didn't help. I guess the next step would be to put the round ones back on and see if they do it too, or if its just because of the added length of the teardrops.
Anybody else have this problem?