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What a great project. I’m super curious how well the magnets are going to work for the long haul. I love the simplicity of the antler handles, nature made them pretty cool.

That is a crazy deal on the antler.
The brushes are looking good. The CA does ad a level of hardness to the centre. Antler is funny to work with because the outside is very hard and the inside...

If you tape the bottom to get it sealed temporarily and then fill it from the top you will essentially fill all of the air space in the porous center. The sides are not porous and the CA will not...

If you have a similar knot if a brush that you are happy with how it feels and lathers, you can copy the loft, of similarly if you have one you wish was more stiff or less adjust the knot...