Large brass brushes don’t always fit into tiny crevices, so here’s how you can make a scaled-down broomstick-style version, using an old brass brush:
1. Using utility pliers, remove one or more bundles of bristles from a plastic- or wood-handled brass brush.
2. Gather the bundles, and insert the ends that were in the brush handle into the end of a piece of 3⁄8-in. (9.5 mm) copper tubing.
3. Using flatnose pliers, squeeze the tubing to capture the bristles.