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Byron,

I like the pattern well enough, but best you give it your own name. It has a tail, a biot body, and a thorax - where the Improved F-Fly has to make do with just a lightly dubbed body, and...

Alan,

Have you tried the (Improved) F-Fly to match that hatch? Has worked quite well for me.

Cheers,
Hans W

Alan,

This design works for me - a #20 BWO in this case:

http://www.danica.com/flytier/hweilenmann/z-dun_bwo.jpg

Cheers,
Hans W