Spent CDC Flies ca be tied very easy if you have the proper CDC. Here is a version that I like to make to imitate a spent ephemera and is tied only with CDC barbs (means barbs stripped from the feather stem).For a size #14 I used the barbs for 3 feathers to make the wings. Some guys consider it too dense but I fish this fly very often on rivers from lapland when big grayling and trout eat after midnight. I need it to floats perfectly on strong currents and to be durable when strong fish fight!
I use the following  materials:
 *Hook: Maruto D04 or Demmon D400 BL
 *Thread: White 70 DEN
 *Troutline Peacock Quill Hand Cleaned in different colors,  yellow is my favorite one
 *Tail made of Coq de Leon
 *Thorax: Squirrel Dubb in natural color
 *Wing: CDC dark grey selected feathers
 



January 13, 2019
Lucien,
Do you have a SBS for this Spent CDC pattern?
Would certainly appreciate it.
Cheers,
Bryan