I have a Lorex LNB4173 bullet cam that I'm installing and am a little surprised to find it doesn't seem to be able to rotate around the axis perpendicular to the mounting base. If I mount it on the ceiling, it seems to be fixed pointing in that direction. I can move it up or down, but not around side to side. The screw holes are not even slots so there's no wiggle room if you mess up or change your mind later. Am I missing a way to rotate it parallel to the ceiling (after mounting)?