Ahhhh, OKie doke!

The main plan was to make my own Brass d-ring. Instead of having the split inside the hinge, it would have been at one end of the flat section just before it curves round into the D shape. That's why I was concerned about it separating under tension.

But looking at the options I think I might have to try a D ring with two Ds. Sort of like a keyring!!

Hmmmm.........