This one came out OK, but I still have a lot to learn. I put a magnet in the bottom so the brush can hang-dry. The knot is a TGN 22mm finest fan. I should have taken some "before" pics. I have a few others on deck, waiting for knots.
Oh, nice work, and great idea about the magnet. Thank God I saw your thread before pouring the epoxy. Now I can do the same to my pending restoration jobs. And I have exactly the same kind of grilled shelves at home.