I have just started tying the last 6 months or so. I have lots of fun with it. I found a good recipe for WD-40's that I have been working on. Im using pheasant tail fibers ( about 3) with brown thread and some caddis greed hare'e ice dub. It's working well but I'm looking for some suggestions on the tail and wing case materials. I'd like to change it up but don't know what it use. What do you use?  Thanks for your help. Ill try to post some pictures of my flys soon but they don't come out very good with my camera right now.  Its hard for it to focus on the size 24's.

I can't suggest a material for you, but I am curious as to your choice of pheasant tail as opposed to the wood duck the original used. Perhaps just for the darker color? I've never tied them although I now it's a simple recipe resembling a PT nymph in many ways with the body being thread wrapped instead of the fibers being wrapped and a rib counter wrap. The resulting fly is thinner that a PT usually is.
 
I don't fish these often, although they have caught some fish for me. I'd love to see pics too. I think I still have some of these in my nymph box and may have to give them some play. I do fish a number of other small mayfly/midge patterns.
 
Thanks for bringing this one back to mind.

I can understand the recipe calling for a relatively inexpensive tailing material compared to lemon wood duck. For more years than I can remember, I've been using wood duck in a kind of longer tail on many nymphs and  even dries(emerger)  to imitate a  trailing shuck. I love the mottling on the wood duck and it's been a staple of tiers forever. Many nymphs are naturally mottled, so the fine barring on the  WD does a great job of imitating, mottling, wing veining, or even segmentation. Contrast is the key to me. Pheasant has similar but not as fine, and often lost on smaller flies. I have sources of Wood Duck from friends on the mid-west flyway. The packages in fly shops are getting a little pricey! Dyed mallard flank , a clump of barbs cut off a  partridge or grouse feather ,some turkey wing feathers and barred teal all can be used as substitutes. The barring  is probably of little importance on a 24.  Hope you get some pics up and thanks for sharing your take on a great fly.
 
Charlie

This is the Coq De Leon offered by Hareline:
 

 
 
...it is an excellent tailing material....the best stuff comes from here:
 
http://www.gallosdeleon.com/Ingles/ingles.html
 
...where the birds are bred
 
I have been incorporating a lot of it into standard patterns like this Tom Loe ASSASSIN variant ( over laying the Marabou Blood Quill tail) and the series of the same I am working on now...
 

 
It would make a very thin tail on a WD-40...
 
PT/TB  

Cool, Coq de Leon is an exotic breed that you don't hear much of around these parts. It's also obne of the oldest breeds, too, dating back to the 1600's. I've seen the feathers tied as transparent wings on some flies, probably from you gents. The feathers are beautiful.