The casting is raised in the center of the circle, preventing teeth engagement. This means that any weight placed on the arm simply adds up (no matter how hard you turn the screw. You can see in the pictures where the raised area turns instead of the teeth engaging... And you first see daylight through the mount Image After about five minutes with a dremel I was able to sand down the raised portion and hook the head in. However, with a brand new product you don't have to do this, if I could give 2 1/2 stars I would
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