This is a well made and fairly well designed ceiling mount. It is heavy and easy to assemble. My only criticism relates to the design of the UST (Ultra Short Throw) projectors. When using a laser-ultrasonic projector and a fixed screen size, zooming is not possible, so the distance to the screen must be able to be set accurately, and not just the tilt axis (post-processing can be easily done by adding a slot to the ceiling mounting plate). I made a wooden board with slots for the ceiling screws (and replaced the anchor bolts with mounting screws and washers - see photo (the washers are not visible as they are between the screw heads and the top of the board). With this board screwed into the ceiling joists, I was able to adjust the screen distance and got a nice square picture without the need for keystone correction.
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