Title: Flawed design
Review: As with others here, I found these mounts simply do not support the rated weight (20 lbs). I attempted to use these with a pair of KEF Q100 speakers weighing 13 pounds. The entire weight of the speaker is supported by a soft plastic ball about an inch in diameter, held in place (theoretically) by a metal clamp with blunt teeth on the inside. The amount of friction offered by this design is insufficient to hold these speakers in place. One speaker slipped down overnight from a 15 degree angle to about a 45 degree angle, and once the plastic ball is deformed it slips almost immediately to a 45 degree angle.The frustrating thing is that the other speaker of the pair remained in place. I suspect poor quality control along with the flawed design.
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