Leave the ends long (both) then pull them reall tight after you pull the tag end through. Sort of like snugging up your shoe laces. Then cut with a very sharp (new) razor edge.
Some threads lock in nice and easy , some slip. If you can't get it to stay , add another wrap.
You can also start the thread for the trim band under the end of the over or underwrap so that end is totally secure. Of course you have to plan that ahead of time. If you do that you only have to lock in the one end after the pull and three wraps should do that easily if you tighten it up good before cutting with the razor blade.
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