No actual instructions were included so I'm not sure I tightened the adjustable screw properly. It feels loose until the locking knob is low enough to touch the mounting surface, but I can't tighten it any further. Otherwise it looks like a durable product. I'm using it on a van to install a cellular antenna that's about 2 feet long and holds that weight well. I was concerned about the small footprint of this mount, so instead of mounting it directly on the roof, I mounted it on a large 1" thick plastic cutting board and mounted it on the roof instead. The antenna stood on the cutting board in strong winds without any problems, even before I mounted it on the roof myself.
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