I'm sorry if this has been addressed elsewhere but I am about to restore my brushes and I need to know what size hole a 20mm knot should go in. Should the base of the knot be a tight fit in the handle or does it need a gap for the epoxy to go around the side of the knot? I already have my badger knots and one handle cleaned out and I'm getting some epoxy this weekend so any help will be appreciated.