in other words,
the problem is that one of them is not tight at all. it has a piece of white plastic at one end of the screw. the screw then passes through a hole in the project and out the other side. on the tip is a black, cylindrical piece of plastic. it is very loose and the projector is moving. everytime i try to turn the white plastic, the whole screw turns and i get no where.
here are some pics:
front view with the loose screw circled in bold and other adjustment screws not in bold.

back view with same loose screw circled in bold and other adjustment screws not in bold.

front view and back view uncircled:






