They referred to it in George Daniel's video. I looked for it on line and could not find it. It appears to be what I am looking for to add a piece of tippet without removing the dropper fly.
Thx, I did the same thing. Easy knot once you see how it is done. Finally got out for the first time yesterday for trout yesterday and fished a sighter. I was rusty but still managed eight trout in a short day in heavily pressured water. Probably rolled another eight as well. Also enjoyed the aforementioned video.