Beware not to tighten too much!!

I tightened too much and pulled the stud which is pressed into the ball joint at the base of the mirror right out.   I repaired it by putting the nut back on to the stud to protect the thread end, set the ball in my vice (protected by rags) and banged the stud back into position.  I then drilled a small hole in the side of the ball and inserted a self-threading SS hex screw.  I filled in the drill hole with black silicon.  You can hardly notice the screw hole and I can tighten down as hard as I want now.

Ed
Syracuse, NY
'84 Wetsy
'89 Wolfsy