keep in mind that as explained here, the more turns of thread we put around a hook the more we tighten the thread. (at least for right-hand tiers wrapping away from themselves: don’t worry, the vast majority of us tie this way. we’re not freaks !)
in other words, we might have to un-spin the thread before being able to flatten and split it. Hans, with his exemplary, minimal thread-wrap method of tying will automatically have less ‘problems’ with this than those who add more wraps. it’s not really a problem though as long as we’re aware of this tightening and un-twist accordingly.
on a personal note, the only ‘sort-of-negative’ aspect i can find to the split-thread technique is the amount of dubbing inserted in the thread has to be just right. if we’ve added too much and have some left over at the spot where we’ve wanted to stop winding, we can’t just tie it off and cut off excess as when using a dubbing loop.
depending on the materials used and how much we’ve tightened the thread and if wax was applied, we can always try to pull out the extra fluff but that’s not a for-sure. so, until we’ve acquired the sense of the exact amount of dubbing we’ll need for each specific pattern, it’s best to ere on on the lighter side and simply add a little more if necessary.
as so often in fly tying, less is more.
