All, Most, here, have recommended WOOL to Bolster knuckles. If you use wool, IMO, it will simply flatten out and you'll be in the same situation. I have been using heavy upholstery thread, (Nylon, etc.) for many years and have never had a problem with it's working" out of the knuckle or of the knuckle becoming flat again, within a short period of time. The times that I used wool, (back in the stone ages :-), I had nothing but problems with it. I think the reason that I haven't had a problem with the Upholsterer's Thread is that it is woven into the knuckle as a continuous thread. BTW, the best tool I've found for trimming the thread, is a large pair of "toenail clippers". They can be sharpened and really cut flush. (The "blade" is convex, as opposed to fingernail clippers that are concave.) Regards, Joe Garrett, RPT, (Oregon)
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