Glad you at least had a 'customer' for your fly. One of the things to keep in mind when you substitute is what the original purpose of the material was for. In this case, the
calf or deer is for floating the dry fly.
While the crystal flash probably looked good, it does zip to help keep the fly afloat.

Stick with it, you're doing fine.

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LadyFisher, Publisher of
FAOL