Hex, TGN sells a 20mm x 60mm Finest Fan Shape, that's what I would suggest... A 22mm knot will be too big when set to 47 mm loft, IMHO...... Drilling the hole out bigger say to 22 can result in an uneven hole if not very carefully done.... Get the 20, when set at 47 mm loft it will more than fill the hole..... Good Luck with your project and keep us posted.
Here's one I just completed with a 20 mm Finest Fan set at 52mm loft..... It's a great brush!
Doug ...
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