ISO: GE Terminet 300 knowledge

Hey all -- I picked up a GE Terminet 300 which appears to be mostly functional, but is in need of alignment -- it's printing fairly smudged garbage with a few recognizable characters intermixed. Character positioning (horizontal) seems to be fairly irregular, for the characters that print clearly. The unit has suffered some knocks in its life and it's clear the photocell board has come slightly loose, which I'm sure is not unrelated, so I'm studying the service docs to get a better idea what's going on. There's an alignment gauge which I could reproduce if I had any idea what it's specs are. The service docs are a bit vague and the photocell assembly is a bit difficult to see, buried beneath the print band on the left hand side. Anyone out there have any experience with these? Any wisdom to impart here? Also, anyone have any spare print fingers? My print band's missing one (a "9") and I suppose it wouldn't be a terrible idea to have a few extras just in case... Thanks, - Josh