Well the Emgo bar end mirrors suck. But that doesn't mean I didn't get them to "work".
As shipped, they are just not the right size for a 1-inch bar. I tried several methods to get the metal clips to compress. This one actually worked.
I kept every fastener that I removed from the bike. I have no idea where this part was originally used (someone will tell me within a post or two) but it works perfectly to properly compress the metal tabs on the bar ends. There were four of these in my hardware tray.
The ID of the bars is 0.75" and this little piece of whatever is 0.74". There is just enough screw length to make it all work. I'd say that the mirror mount was tight and compressed within 2 rotations.
Problem solved. Not really. The bar end mirrors wont rotate or fall off the bike, but the mirrors vibrate so much that all you can see is basic shapes. Weighted bars wont help these mirrors. They are vibrating at the cam-lock that is used to adjust the arm from vertical to horizontal.