I recently bought an Orion 8" f/4.9 reflector telescope with no focuser. I bought a focuser and installed it. While using the telescope, I can not achieve focus with out pulling the eyepiece out of the holder about a 1/4 inch. So the images are almost getting focused, but its just out of the focuser's reach. Everything is collimated as far as I can tell, but I can't do a star test because I can't unfocus enough. Are my mirrors messed up or something? Thanks a lot!