For a long time I had a bottle cap from a bottle that had long since served its purpose and was thrown away. I saved the cap because it was better quality than the bottle it came with and I thought it could be used on another bottle in the future. However, I was looking at one of my boar brushes and saw that the handle was the same size as this bottle cap. I knew I had a TGN Synthetic knot at my disposal and then one thing led to another. I stained and finished the wood with Minwax® Polycrylic®. After increasing the bore of the cap slightly and filling the inside with epoxy and BBs for ballast, I proceeded to finish the knot with epoxy and the rest is seen in the images below.