Anyone else tried a this or a similar method?

Its interesting. I gave a half dozen pheasant tails back in the late
90's with a closed cell foam back to my partner John (of Penns Clave
Jumbalaya fame). I learned the tie from the the british mag,
Flyfisherman and Flytyer. John fishes the Kern alot and knows Guy
Jeans. I'm thinking its all a big circle.
By the way, for sulphers, I use yellow foam. Works great.
Frank Reid