Why is this not implemented?

[Super]

Now I get it

I must admit that I was still confused even in reading your last Post as to what you were referring to but the more I studied your picture I finally got your point.

So what is needed is actually to have 4 i piece sloped curves.

2 as they make now,
Female connector at top, curve facing right 'A' in your picture
Male connector at top, curve facing left, 'B' in your picture

What they didn't make and what you are referring to (I think) is
Female connector at top, curve facing left  (lets call that 'C')
Male connector at top, curve facing right (lets call that 'D')

Do I have that right now Vio?