To do this sort of repair, I gently sand and clean both surfaces with 600 wet-dry paper and alcohol...just cleaning the solder, make sure not to sand through the solder. I then pound some wire solder flat and thin on an anvil and use an exacto knife to cut it to the exact shape of the contact. I put it between the two pieces, wire the pieces tightly in place with steel wire and heat quickly until the instant I see the solder flow...this is sufficient. I generally heat the part, not the horn body.Dave dix said: