One way to think about the technique without pattern reference is: “A post of (one or more) material(s) pulled forward through a post of (one or more) fibrous material(s).”

The simplified idea of one post being pulled through another post opens up the possibilities. You can make the first post from a huge array of materials, and as long as the second post is made from something fibrous (from a clump of larger-diameter materials to fine fibers), you can get a diffused hackle of sorts. With that in mind, my most-used materials for the second post would be deer hair, pheasant tail, twinkle Organza, and the like.

You can also think about using Diffusion Hackling on the underside of the hook shank. In that way, you can make some cool-lookin’ dun imitations and so forth (hint: think about tying the first post down on the underside of the shank, than pulling the post up and over the hook eye, and then tying it down again facing toward the rear of the hook. Instant wing!)

Have a great time playing with this technique, Satoshi, it can really make one’s flies pop in some new ways…

So this technique is for spinner or maybe emerging nymph patterns? Or even limited to? Definetely the photo suggests good looking spinner. Or this can be somehow applied to dun, emerger, caddis/midge adult, pupa patterns?? I am not asking you specific patterns or lists of materials but if you can give me some tips and hints, that will be an answer and give me ideas.

Sorry, almost talking to myself but I am sure this technique do something to improve or add some new ideas to spinner patterns that I know of. If I can finish with a bit of up-wing look, it might be dun, emerger, or something…along with combination of thorax and tail/shuck materials…. I will definetely try some idea with this technique during the winter. Then I may come up with nothing…it’s OK, still fun part of fly tying. SY