Mount the 3x long hook and wrap the shank with heavy lead wire for weight, then start black thread and lock the lead in place. This fly is meant to sink like a brick.
At the bend, split a pair of black goose biots into a V as tails.
Twist a length of black yarn into a tight rope and wrap it forward to the 60% mark to form a segmented abdomen.
Tie in a section of turkey tail over the thorax to be folded, and tie in a black hackle by the tip.
Dub a full black thorax, then palmer the black hackle through it as legs.
Fold the turkey tail forward over the thorax twice (double it for durability) and bind it down as the wingcase.