I've been working on a few ATT 705s at work (they are monochrome terminals that emulate a few different types of terminals, but they are so ancient, I can only guess that those would be Wyse and VT100 and the like). The major problem with them, aside from the screen burn, is one corner or side is 'pulled' in or up, creating uneven lines of text. I've adjusted the yoke, moved 'magnets,' and still can not get anything straight or at 90 degree angles.
Any suggestions?