I am sure b&o use to publicise the fact these controls were made of some sort of zinc alloy or similar. Not sure that helps though!
They are some sort of cast alloy. So that would make sense. Also done a black one today. Didn't bother to strip that though, as I wanted to see if the recoat setting on the gun would work. Which it did, but I should have flashed the metal first. Got a few tiny imperfections which I am not happy about.
Craig🙂


