Try this page and look at Step 5. Basically the idea is that you make a loop with your thread, apply some dubbing to it (less is more) with or without wax, and you use that tool to snag the bottom of the loop and spin until the dubbing and the thread twist together enough to look right.
[url=http://globalflyfisher.com/tiebetter/dubbing/making_your_own.htm:605fd]http://globalflyfisher.com/tiebetter/dubbing/making_your_own.htm[/url:605fd]
"If I'm not going to catch anything, then I 'd rather not catch anything on flies" ... Bob Lawless