I'm thinking about getting this mount for my Sony VPL-HS20: Projector-Gear Sony Projector Ceiling Mounts for projectors I need to know if I can get away with using a 3" extension with this mount. This will put the projector about 12" or so above the top of the screen. I've been messing about with the vertical/horizontal keystone features to get an idea how this would work out. The HS20 does not have a lens shift except in certain modes so I guess I'd have to point the projector at the screen and adjust the keystone from there? I was just hoping that someone here could tell me if these tolerances will work for this specific projector. I haven't been able to find information about this online. Should I maybe get the longer extension bar? Any help with this is appreciated.