Abstract: An auxiliary double frame for a rotary vacuum mold unit or rotary thermoformer has a center auxiliary frame member and one or more auxiliary transverse frame members. The thermoformer has several identical frames that carry the plastic sheet workpieces from a load/unload station to a heat station or an oven, then to a vacuum molding station, and then to the load/unload station where the molded product is removed and replaced with a blank plastic workpiece. A center auxiliary frame member is mounted onto the front and back main frame members, and can be positioned on center or to the right or left of the center of the frame. Auxiliary transverse frame members are employed with the standard transverse clamping frame members. Pneumatic cylinders mount on the transverse clamping frame members and on the longitudinal frame members for operating pinbars. This system permits two or more molds to be employed at the same time.