One final point which may be important here. A friend I met on the
water watched me using this rig, and was very enthusiastic about it. I
showed it to him,it really is very simple, takes longer to describe
it, than to do it. It also only takes seconds to adjust the depth, or
even to remove and re-attach the dry fly if desired, and the leader is
not compromised at all. No cuts, no knots, or other messing about.

Anyway, he set the rig up, and wandered off to another run. I met him
again later in the afternoon, and he told me that he had been broken a
couple of times at the loop on the eye of the dry fly, ( he had no
leader rings, and I had none with me), which surprised me a lot, as I
have never been broken like this.

It turned out he was using fluorocarbon tippet, and it seems this
stuff does not like being kinked sharply! Maybe he had poor stuff, or
something, or there were other reasons for this. I really don´t know.
I don´t use fluorocarbon, I only use nylon.

If you want to use fluorocarbon line, this may be an issue for you.
But I don´t know, as I have hardly any experience with it. I only
tried it for a while, and then went back to using nylon.

TL
MC