The first time I saw metal cast on a wood mandrel was when I watched my Grandad cast a ring for my Grandma out of a piece of a zinc canning jar lid and a garnet he found while hunting deer.
Twenty years later when I needed to cast a nose cap on a pistol kit, I tapped into what I’d seen, and what I remembered. Don’t overheat the metal, tin, lead free solder, of lead free pewter, seem to work best, rub your incised pattern with carbon from a carpenters pencil. That’s pretty much it.
Hungry Horse