How to stop mirrors from moving?

Terminator:
The mirror and stem are connected by a simple ball and socket set up. If this is where your problem is, you may be able to use a drop or two of Locktite in the joint to firm things up. With the vibration in the bars of the Beast, the Locktite may not work, or may not work for long.

We trudge on.
 
Over 100mph, my right mirror would fold back.
The problem is the stem protrudes past the bottom of the mount hole,
so tightening the nut does nothing, just spins the mirror.
I tried using a shim in the mount hole to keep the stem higher,
but that required a better fit than I was willing to spend time on.

I added a washer at the bottom of the stem that just fits over the stem.
Now the bottom nut tightens up and the mirrors don't move.
 
The allen on my original mirrors was 6 MM I think and Triumph aftermarket are 4 or 5 MM.


There is also a tolerance ring that eventually wears out and lets the mirrors fold back at higher speed. New tolerance rings from Triumph could not possible cost very much.

The tolerance rings fit around the stem of the morror and crush slightly when the allen bold it tightened down. The correct torque is 10 Nm.
 
A stainless washer, as said above, under the stem solves the issue in 20 seconds.
 
My left mirror kept turning at the base at high speed. With a shim in and lockwasher it soon came back. Tightening led to near stripping the hex head and still a wobbly mirror. Today I put some Quicksteel between the rod, shim and base and tightened it to set it and squeeze out the excess but the hex head stripped. Was gonna remove hex bolt and add locktite after it had been set but didn't do it due to the stripping. Took it for a spin 30 minutes later up to 120 with no movement of the mirror. About the stripped bolt, I'll cross that bridge when I get there.
 
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