Mystery solved. There are two different ways of carrying out the fold in the first part of your step F. Of course, I first did the one that doesn't work.
--Art -----Ursprungliche Nachricht----- ... > Actually, I wasn't able to follow your instructions, Edley. I get line 6 > to be parallel to line 3 (45 degrees). I think there's a mistake, but I > haven't figured it out yet. ...
