Razzle, just by way of clarification. The nut/bolt solution you are looking to buy for your F3 does NOT stop the covers from falling off. It is to correct the mirror vibration. The other issue is that the painted mirror covers fall off. This is a separate issue, and can only be rectified by adjusting the clips that the covers push into, or by something like a small piece of tape underneath. Hopefully I haven’t misunderstood what you are saying……..from the late ‘21 builds, both these issues were supposedly rectified by BRP. I have had no issue with either on my late built ‘21 RT, but my ‘16 F3-L certainly had both issues.
My coverd have never fallen off, Peteoz. Each time (5 times total) it has been the complete mirror assembly/s hanging by its electric cable. I hope Slingmods bolts do the trick, leaving no longer any need for embarrasing black tape.