I'm trying to learn to tie mosquito flies. The recipe I'm using is from Western Trout Fly Tying Manual or whatever that's called. That version shows a light and a dark hair wound up the butt like ribbing to make stripes on the fly's butt. I've tried several types of animal hair, but they all seem to break off. I know it won't be as floaty, but can I use thread to make the contrast instead? Is there any major disadantage? Maybe there is some trick to tying with hairs in this way? I'm tying on a Renzetti Traveler and have tried winding the hair and using the roto-matic. Thanks for advice!