I have my mount built. It is a customized version of the monkey man mount. I have it so that I can adjust height, skew and angle. However, I will not be able to adjust left, right, forward or backward. I assume this is the same issue you have had as well.
So, I have my screen mounted. I have my projector on a mount. I can lift the projector, which is on the mount, to the ceiling and get a rough approximation to the screen. But, before I put any holes up there, I want it to be as close is humanly possible.
I know that I have some adjustment in height and skew. I want to set my holes in the ceiling once.
How did you guys determine the exact middle of your screen for the projector lens? Considering mine is about 15 feet away, I can only think of option, and I am not sure how well it will work. My thought process is something like this:
I have two small holes on the screen mount. I tie string to each hole and stretch it out to the mount location. If the strings are each the same length, I know I am in the middle of the screen. I may then need to adjust for the height of the lens, and mount. Does this sound reasonable?
Either that, or eyeball it.. I could hold the projector up and try to get it close to perfect on the screen and have someone mark the holes for the mount. But, I have tried stuff like that before and it is just error-prone. For me, anyway.
How did you determine the right mounting location for your mount?