I've put together a few dozen brushes over the past number of years. Some were rebuilds using vintage handles, some used handles I built myself from antler and/or wood, and others used handles purchased from "overseas" suppliers. All of the brushes used knots from a few of the better known suppliers in China, including Vigshaving. All of the knots were fixed in place with two part epoxies, and to date, only the one I am currently using ( a reasonably nice "finest") has shown any "beyond normal" degree of shedding (mostly from the centre of the knot). I want to believe the problem is with the knot itself, not with something I did in setting it. Any thoughts otherwise? By the way, I'm not usually a daily shaver, and am fairly coscientious about ensuring that the brush has a chance to dry properly after each use.