Another great fly for using up substandard CdC; tried wrapping feathers onto the loop with consistently poor results so I went with the DIY Henry's Fork Hackle method. Tied here as a Flav; change color/size to suit your needs.
hook -Dai Riki 300 #14
thread - Danville 6/0 olive
shuck - Congo Hair brown
abdomen - goose biot olive
loop - UTC 140 olive
hackle - CdC dun
thorax - dubbing olive
Part 1
mash barb, start thread, tie in CH at 2/3 mark, fold and wrap to bend; trim shuck
moisten biot, tie in notch-side down (or up if you prefer a smooth body); wrap to 2/3 mark, tie off/trim
tie in loop material
create a dubbing loop with tying thread
fold CdC (5 feathers used here); grasp tips in clip, trim away quills