fixturing for repair of automobile radiators is disclosed , usable for recoring of either brass or plastic tank radiators , including clamping gates providing parallel rails adjustably spaced to receive the radiator header with an air cylinder exerting clamping pressure on the tank top . the radiator sits atop the rails of a first set of clamping gates when resoldering conventional tanks and is recessed between the rails of a second set of clamping gates which are alternatively installed for decrimping and crimping of the header tabs of plastic tank radiators . decrimping and crimping hand tools of special configuration are also disclosed , cooperating with the rails during use .