Zesbaugh, yes your focussing problem sounds really odd; sorry I misunderstood you. It shouldn't be possible to swing the focus between 1 metre (3.3 ft) and infinity in one-third of the travel, even with the screen out of alignment.
Could the viewing lens have been taken apart and wrongly re-assembled? Look for silver scratch marks around the lens.
I have my 635 in front of me as I write. If you unscrew the focussing hood's four silver screws, you'll find the screen is held in place underneath with two silver clips behind two black protrusions; it's a single unit. If you can see texture on top of the screen, it's been put in upside-down, but even so it shouldn't be that far out of alignment unless it's been bodged. The mirror could possibly cause problems if it's wrongly placed; it should be held between three metal protrusions.
With the focussing knob at infinity, the shutter and lens assembly should be about 0.5mm from the camera body, and about 9mm when set to 3.3 ft. These distances should be the same all around the assembly. Unevenness here points to alignment problems with the focussing mechanism.
It sounds to me like your camera has been seriously messed around with. I've taken my 635 to bits several times and seem to remember having a problem correctly aligning the focussing mechanism; it's been a while. They are lovely, sturdy cameras, a joy to use. I hope you manage to solve your problems.
Last edited by kevs; 03-19-2010 at 10:59 PM. Click to view previous post history.
Reason: typo - 'dodged' --> 'bodged'.