Used McPhail's downwing sedge version as the base; swapped in a duck (female redhead used here) back feather for the mallard quill segments, just for a little different look.
hook - Dai Riki 075 #10
thread - Danville 6/0 black
tail - brown hackle
rib - x-small wire gold
body - mylar tinsel gold
body hackle - brown (undersize by 1)
wing - duck back feather
front hacke - brown
Part 1
mash barb, start thread; wrap to bend
measure (shank length) some hackle fibers; tie in
tie in rib & tinsel
wrap tinsel forward; tie off/trim
tie in hackle; reverse palmer to bend
capture tip with wire; rib body thru hackle, helicopter end