Did my reknot today. Was a bit squeamish about taking power tools to a brush so investigated steaming. I had a whipped dog brush in butterscotch which I've always liked the handle but the knot never really did it for me. I steamed it gently for between five and ten minutes, then got a pair of pliers near the base of the knot and with a bit of gentle force it popped out. Cleaned the remaining resin out with a Stanley knife and a small flat blade screwdriver.
To refit my new knot I went for silicone sealant, as I thought it may be a bit more forgiving than epoxy seen as it was my first time doing it.
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Before and after shots, the knot plug at the base looked slightly squashed from the damage but I'm hoping it holds up. I'll leave the silicon to cure for a few days then see how it performs.
I'm quite pleased with myself