My scooter mirror is dropping all the time at the ball type hinge to adjust it in any directtion. Its basically worn out I guess as its friction based. There is nothing to tighten. I am thinking of silly ideas like insulating tape, trying prestik or glue to keep it in a (even fixed if need be) position. Or a more elegant solution like a spray with some grain in it which increases friction. Is there something like that? Does anybody have a better idea? The mirror is perfectly fine otherwise and not ready to be scrapped.