William has fixed you with a video and I'll add this. When you make hair wings, after you have 3 or 4 good snug wraps of tying thread on the hair place a nice drop of cement on the ends and give them a few seconds to dry a bit. Then go on with the rest of the fly.
Hair is notorious for pulling out from flies. keeping each bunch a bit sparse and gluing the butt ends will keep a fly together through many a fish caught.
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