It's only recently that the resins have improved.

I remember that the plug of hair would always fall out of my fathers wooden brush handle if he let it dry out on a window ledge for too long. He'd then glue it back for another six months. That was a Plisson. I've never forgotten his annoyance and when I got older and appreciated the price you had to pay even then for such things, I looked to other manufacturers. I purchased a Simpsons brush, another supposedly good make and the hair plug fell out of it's handle. But nowdays, they seem to have got it right. It only took them about a century.