Start thread at the 50% mark, tie in a length of fine copper wire, and wrap to the bend.
Dub a slim gray beaver abdomen forward over the rear two-thirds of the shank.
Tie in a dark dun hackle and palmer it back to the bend in 5-6 turns, then hold it there.
Spiral the copper wire forward in 5-6 open turns to lock the palmered hackle, then helicopter off the wire.
Trim the palmered hackle flush across the top of the body so the wing can lie flat.
Roll a clump of barred wood-duck flank into a shank-length underwing and tie it in over the body.
Cut matched left and right slips from a fixative-treated goose quill, tent them over the body, and pinch them down with soft loops pulled straight up, holding them low and tight.
Wind a dark dun hackle 3-4 turns at the front for the collar, whip finish, and cement.