When installing on a hand-held handle, you have to prepare some spacers
Even if the nut is fully tightened, it can not be fixed.
In my case, I feel that it is settled to just right by wrapping a rubber plate about 3 mm around the entire circumference of the steering wheel.
Because the metal band itself is a soft material, if you tighten it forcefully, the hole through which the post will pass will spread widely.
However, the sharpness of the image due to the glass mirror surface is wonderful, and the mirror made of plastic makes it possible to make sure certain backward confirmation.
Well I still have to look back and see backwards afterwards