A method for fabricating a thin metal shell that has connecting components is disclosed. The system includes a container having a mouth and a cap coupled with the mouth. An analysis processing section 208 makes multivariate analysis with respect to the collected operation data, and thereafter, data used for prediction is selected based on the multivariate analysis. First portions of the first jaw have in cross section a first shape which remains generally constant in area along the first jaw, while second portions have in cross section a second shape which varies in area along the length of the first jaw.