Swivel clamp doesn't tighten so limited positions available

As mentioned by others, the swivel clamp doesn't tighten in any way that holds the arm in place. There were no directions included so if there is some way to adjust it, it's a mystery to me. The arm can be balanced horizontally but if you try to position it at an angle, the bar just slips right through the swivel portion of the clamp. This was a disappointing purchase.

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