I forgot where I learned this "Tying Tip", but it does work....
If you are looking to put a wiggle in your wet, nymph, streamer fly patterns.
all you have to do, is affix the wing/wingcase upside down. The concave side (bottom side which is dull) of the hackle, when faced upward, will cause the hook shank to wiggle (wobble) in the water.
~Parnelli
"I am starting to think that I am developing "Sometimer's Disease", sometimes I remember things, and then there are other times, when I do not remember things"!