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Interesting and worthwhile video.  It's kind of amazing how many things and subtleties there are to learn in flytying.  A never ending  journey which adds to the enjoyment of it.  If one could perfect it in a few days it would become boring.

Thanks for posting.

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Although there is a lot of good information in that video, there are a few caveats:

1) His explanation of "denier" is wrong.  "Denier" is the weight, in grams, of 9000 meters of the thread.  So, although it is a real standard, it doesn't really tell you any more about the thickness of the thread than the "aught" system.  For any one line of thread from the same manufacturer, 70d is going to be finer than 280d and 8/0 is going to be finer than 6/0, neither tells you much about the relative diameters of thread from different makers, or even different threads from the same maker.

2) What he says about the thread tightening with each wrap, that's only true if the wraps are in clockwise direction when viewed from the hook eye.  For a right handed tyer, that's the conventional direction (over and away). If you wrap in the unconventional direction (over and toward you) or tie left handed and wrap over and away, you're untwisting most threads.  Of course, once it's completely untwisted, you start twisting in the other direction.

3) Silk threads such as Pearsall's (now Morus) are twisted in the opposite direction than most synthetic thread, so wrapping in the conventional direction for a right hander will untwist the thread rather than tighten it.  Also, you need spin the bobbin in the opposite direction to flatten/tighten the thread than he tells you to in the video.

Still, it's a very good video.

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