Bought a Made Rite 100 bristle brush and used it a couple of times, but it was pretty worn out. Here is how it looked:

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Here's the bottom:

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Cut the bristles down as low as I could:

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Taped it up, wrapped a shop towel around it, and put it in a drill press vise:

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Drilled a bunch of holes in the remaining knot:

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(have to go to another post for the final picture and some questions)