I read lot of review about this product not good for Optoma hd20 . I buy myself the Optoma hd180 which be newer version of hd20 . from other review i short list problem in mount with the following : - too many screw option - unclear instruction on how to hook the thing up - very tight screw because of thick paint here be what i do and in the same order . - check out the manufacturer website , they have a 3d image of this product when assemble , this give I a understanding of what part do what and how the assemble product should look like , especially the adjustment arm at the bottom go in and out . - loosen all the adjustment screw not too loose enough to make part move -lrb- this be not easiest thing to do . have to use additional tool -rrb- - seperate the part that go into ceiling -lrb- will call it '' base holder '' -rrb- from the other part of mount -lrb- will call it bottom part -rrb- . this can be do by unbolt only one screw , call `` quick release '' . - hook up only 3 bottom part screw to hd180 -lrb- it have room for only 3 screw and one big one which i do not use , use the smallest screw include in the kit -rrb- - measure center of screen where i want and put the base holder to the ceiling with 2 drywall screw do not use the one in the kit -lrb- too big and need wrench -rrb- , use screw with screw head instead ; easier with power drill , make sure they can take 30 pound . - Hung the projector `` Bottom part '' to `` Base holder '' with `` qucik release '' screw power it up to see where image be be project -lrb- need second person to hold projector in place -rrb- , tighten the screw with screen adjustment . - with all proj set to default adjust the screen for precise setup . take I 1.5 hr to get it up and run , most time consume be side way adjustment screw unloosening , make you doubt what way be the correct way to loosen . trick be to use a longer handle tool to unscrew it , i put a screwdriver on back of the hex that come with the kit and it move easily .