I bought a Hafny bar end mirror which I thought would be easy to mount. I removed the handlebar and in doing so pulled the cap off of the end grip, from where it goes into the end bar. I had to use needle nose pliers to get the insert out. It just wouldn’t come out after loosening the screw. I attempted to in stall the mirror and it was too small of a fit. Directions say you may have to use the spacer (provided). The spacer was too big to fit in. The description on the box say that it’s made to fit 14.8 - 23mm. I’ll have to return it. Has anyone used a bar end bike mirror on the 500? And if so, what is the size of the bar opening? I don’t know how to measure opening.