I don't know man. Does anyone know exactly what that black stuff on the end cap is? Is it just aluminum that has been anodized? Worse comes to worst, I'll plate it in copper and then plate it in nickel or zinc. I think zinc or tin plating will match up color wise to the body pretty well, but I'd prefer to just use the oven cleaner if that will do it. I'm really sick of my kitchen smelling like dirty feet from all the white vinegar I've been using to try replating a Graflex tube.