I first saw this pattern a number of years ago in Southwest Fly Fishing Magazine, without a tutorial. It is by Colorado tier Eric Pettine and the fly reminded me of some off-the-wall soft hackle that I had tied up for the water pictured below, quite some time ago. That one employed partridge for the hackle, a copper bead behind it, light olive thorax, rusty brown abdomen with a copper brown, wire rib. It was the only pattern that consistently took fish when the water in here was raging from bank to bank.