Odd i use these as well and don't have your problem, they are not nearly as nice as my pre crash rizoma mirrors, but i found i could get them tight by using the 1" bar insert rather than the one we're supposed to use. Also one of the mirror glass pieces did become loose and started rotating in the mount with vibration so it needed a bit of silicone caulking on the back and it's good as new. You do certainly get what you paid for...but my NICE rizoma mirrors ran $140 EACH