There is a video on youtube that shows how to remove the old knot using steam. The brush goes into a small bowl end down and the bowl then goes into a small pot with water in it, about 1 inch or so. You heat up the water until it boils and produces steam. After 5 min or so the knot will just pull right out. Use gloves when handling the hot brush to avoid injury. I tried this and it worked perfectly. If I need to go it again I will try a slightly different method, by holding the brush by the end and submerging the knot into boiling water which I suspect will work as well and perhaps faster. I worry about damage to the handle material but when I did it the handle was wood and all went well. If you have a way to produce a steam jet, like an espresso maker, I would try that first, just make sure to wear gloves. good luck.ive got a 28mm beehive with bad knot in it. I'd love to save the handle and put a Maggards black and white knot in it.