I can recommend @Steven_Jagger , he turns handles in a range of woods to your requierments or there is @mervyncadman who I'm sure will be able to sort you out if you prefer resin handles. P.Got a couple of brush knots but where do I buy handles, finding steaming brushes to much of a fuzz so handles only?
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A chunky handle for a chunky badger. This is how far my skill and patience will take this project. Now only lacking some hot water and very light sanding plus oil and maybe wax finish.