Let me look when I get a chance, hopefully later today. I haven't had to look for that screw, I only knew about the discussion. It strikes me it was somewhere else though because it reads differently to me than a set screw on top. The post mentions loosening the set screw, moving the takeup lever connection to the right - So I'll say that's away from the handwheel (ETA: Since you're looking at the back of the machine already from the instructions) - then tightening it up. I'll shoot a pic if I can see what they were talking about on the SSS yahoo group.
In your two photos, this makes sense. I see two visual differences between the 2 machines. I think there's a chance that this adjustment will square them both up.
The red circle is probably the "bend" people are talking about - I think it's a mispositioning rather than a bend.
The Blue is a different position of the "Cam" in relation to the needlebar.
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