I must admit I've seen some beautiful brass dome covers, particularly on the Isle of Man locos, where the joint is invisible. I guess the trick is to use a filler rod of the same composition as the brass sheet. My Isle of Man Beyer Peacock has a one piece casting for the dome. I don't know where the casting came from but it is a heavy casting and the machining would have been beyond me and the guy that did it did a superb job. Dave. MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.