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Alan has it right on this - "counter ribbing" or "counter winding" are rather ambiguous concepts. The key thing is the different pitch the respective materials are wound.

Cheers,
Hans W

Well spotted, Warren. It is faceted wire:

http://www.danica.com/flytier/temp_pix/faceted_wire.jpg

Flattened sections provide a subtle glint.

Cheers,
Hans W

Kinda. I fish it on a dropper, suspended from the bend of a dry.

http://www.danica.com/flytier/hweilenmann/rockworm_spider.jpg


Rockworm Spider
Hook: Kamasan B175 #14
Thread: Gudebrod 8/0, olive
Hackle: Whiting Farms Coq de Leon hen, light pardo -...