Rizoma Bar ends and Reverse Retro mirrors

[KIKH400]

I got a set of rizoma reverse retro mirrors used, and bought a set of rizoma bar ends to mount them on.  I got the bar ends from Motivation Accessories, and they have a rubber expanding thing that's supposed keep the bar end stable and in the bar.  They don't work.  The bar ends rotate or move when I ride.

I searched here and saw that there is a metal collet used on some bar ends instead of the rubber thing.  The guy I talked to at Motivatoin Accessories is looking into this.  He doesn't know if its a rizoma part or not.  Any suggestions?

[Bones]

i had that issue once. I just wrapped the rubber with several passes of electrical tape so that it can create more surface area.

done.

[KIKH400]

I tried regular electrical tape and friction tape.  The mirrors/bar ends keep moving. 

[CDChase1981]

My Rizoma bar ends came with a metal expanding piece as well as the rubber thing. The instructions showed to use the metal one if you are mounting mirrors on the bar ends.