In a conversation the other day the idea of adding in a Wally Wing to a Marc Petitjean Dun came up. Here is the result. I tied the fly as Marc does his duns, with the Wally Wing added before forming the thorax / wings / hackle of CdC.
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Honestly, I'm not sure it adds enough to be worth the extra effort. I will have to tie some more up and field (or stream) test them.
Cheers,
A.