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OK, more research on the "wrong way round catches" First, this is clearly a design problem, not just an assembly problem, because the catches are attached to the sliders, so you can't just switch them around. Second, I investigated a 750C and a 755C, and both have the wrong way round catches. Remembering more clearly, I believe in fact that it was with the arrival of the 750C that I started to have this problem. I clearly remember that at least one of the earlier machines (700C and or 720C) did NOT have this problem. I really think that Joseph has put his finger on exactly the right explanation. A small, but quite annoying, screw up!