A diaphragm is gained by the co-molded of a dome part, a voice coil junction part, a cone part and a peripheral part through the injection mold of thermoplastic resin. The method comprises monitoring the saturation level of a reactor shift bed catalyst in a reformer; automatically detecting that the reactor shift bed catalyst has entered a saturated state; and automatically regenerating the reactor shift bed catalyst in response to automatically detecting the saturated state. In a preferred embodiment, the formed solution is briefly heated to generate a temperature gradient through the body of the formed solution. The weight support, in at least one embodiment, includes upper and lower support pieces arranged at an angle to each other so as to form a wedge-shaped area in which dumbbells can securely rest.