I have been obsessed with using mallard in the wings for duns and emergers lately. This is an attempt to make a sbs of the CdC Dun. I apologize for the poor quality photos. But they will at least give you a general idea. For this pattern you will need a splitable thread. You can use Dynema, Serafil or Petijean threads.
1. Tie in a tail of rooster or Coq de Leon fibers. Make it a bit longer than normal.
2. Now prepare the peacock quill and tie it in. I do not use UV (yet), so i just use standard varnish. Choose a bunch of mallard and gather them to make the impression of a wing.
3. There are lots of tools for this purpose out there. The best are, without a doubt, the ones from Marc Petijean, but an old-school paper clip will do the trick as well. Choose two cdc feathers, a mix of grey and black is usually a good choice. Cut them close to the stem.
4. Split the thread and spin the cdc to make the hackle. Pull the fibers bacwards and wind the cdc as a hackle.
5. The end result should look something like this. The colors can off course be changed to suit all mayflies…