Apeman was attached to it. It needs to be lowered further than most simple mounts. The extension allows any distance between the specified minimum and maximum heights. (i.e. not notched but holds compression). The device is designed and its installation is easy. A few months of use, no complaints. Pro tip: The drawbar works best when pressed against the floor, not the ceiling. Once I did that, the projector "wouldn't move" anymore, as others have noted.
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