This is a four degree of freedom mount originally designed for a small LED projector. Wanted something easier to adjust finely than a ball mount and I needed the extra DOF for my particular situation.

Designed around an "L" made of 1/2" copper pipe. The pipe clamps pieces have some tolerance in them but are intended to be tight. Running the pipe through them a few times will smooth things out a bit for easier adjustment (or use some sand paper).

Carriage bolts, washers, and nuts tighten down the pipe clamps, and a socket head screw holds onto the projector (or camera or what-have-you). Adding some rubber or something else grippy to the projector mount will help keep it from rotating. Included is a picture of how the bolts should go.

Orient the parts sideways so that the cross section of the pipe clamp areas are flat to the bed.