i don't watch it much, but glad i did this time. "how it's made" was on. it showed how a trombone was made by hand. just in time- as i have a trumpet to engrave for a guy. i'm glad i watched this show. you all may not be aware, but such instruments are made literally from nearly paper-thin brass sheet. if you ever have to engrave a trumpet, trombone, saxophone or the like, the stuff has to be done ever so gently and the inside should be backed up with modeling clay in a plastic bag or something. the metal is far thinner than you think !