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I got a 38 mm knot in a custom, they can be floppy if set too high, or its to loosely packed, a good knot set properly will be fine, and the Shavemac will be a great knot. Tc

If you like their knots that's the way to go, large knots are available from most of the big names. Tc

Not sure but some do,, you can also get one of the brush makers here to swap out knots for you too. Tc