Brass stem band repair

Maybe they can be brazed

It is probably possible to braze them back together. I'm assuming that they are mostly broken at a screw hole. Cutting away the remains of the hole and creating a bit of a scarph would allow the braze to take hold. The problem would be that the brazed area will be fully annealed and therefore very soft. Bending would be interesting to say the least. At the price of non ferrous material on the scrap market you might be able to sell them for scrap and buy a few lengths of new material. I'm currently out of scrap stock or I'd try it out of curiosity.