Some photos of turning the button for the concertina bellpush this evening. The externally visible dimensions are copied from the metal buttons of my Lachenal English. Underneath the top it’s totally different because it won’t have a conventional lever action (so no need for a cross hole, but it does need a larger diameter lip to stop it coming too far out of the hole in the top). I turned it from 10mm stainless steel rod using a brazed TCT tool bit on my manual Taig lathe.
