I am having a lot of issues with these bar end mirrors where they become loose fairly easily, even after using proper tools to tighten them rather than manually using the hex key. However after a few easy twists, the mirror with the screw comes off but the other inner pieces get stuck inside the bar. They are supposed to fit 7/8" bar ends.
The last set of mirrors that I am trying to fit are:
BikeMaster DC Folding Bar End Mirrors
I thought I finally tighten them properly by gently using a drill but after hitting a pot hole on the road, one of the mirrors came off. It wasn't very ideal to ride blind on one side. Even if they feel tightly placed, I now have to worry about if they would get loose again while riding.
Is it because the product is "cheap"? I really doubt the bar itself has expanded in radius due to any major force that cause them to get loose, pretty sure I didn't push that hard.
Any suggestions or has anyone had similar issues with bar end mirror fitment?
Thank you for your help!