Found this version on the Soft Hackle Journal site. Tied here as a western green; change color/size to meet your drake needs
hook - Dai Riki 280 #10
thread - Danville 6/0 black
tail - mallard dyed lemon woodduck
abdomen - turkey biot olive
thorax - Zelon dubbing baetis
rear hackle - grizzly hen dyed olive (1tbsp Rit Golden Yellow, 1tsp Rit Dark Green, 1 cup water)
front hackle hen black
Part 1
mash barb, start thread, wrap to point above point
measure (shank length) some mallard; tie in/trim
tie in (moistened) biot, notch-side down for the ribbed effect; wrap to 2/3 mark, tie off/trim
create loop, insert dubbing, trim, spin, wrap