An apparatus and process for molding workpieces usable for consumer products. The workpieces may be injection molded with a cavity formed by a core pin and have an undercut, such as internal threads, in the cavity. The apparatus has a drive system with a stripper plate mounted for alternatingly forward and retracting axial movement. The stripper plate is axially driven and drives a stripper sleeve barrel cam and a core pin base barrel cam, each having respective cam followers. The respective motions of the cam followers are superimposed on a stripper sleeve insert, which drives a core pin sleeve. The core pin sleeve is subjected to responsive three-dimensional motion, allowing an internally threaded workpiece to be unscrewed from the core pin sleeve. The system does not require separate drives for the core pin sleeve and further allows each mold cavity/core pin combination in a mold half to be unique.

A preform suitable for blow molding into for an outer container usable for a pressurized aerosol dispenser. The preform has a longitudinal axis and a closed end bottom, an open neck. The neck has threads for accepting a valve having complementary threads. At least one pawl or ratchet is operatively juxtaposed with the periphery of the preform. The at least one pawl or ratchet allows onward rotation of the complementary valve in an onward direction, and prevents detachment of the valve in a reverse rotation direction. Any such preform can be blow molded into a corresponding outer container, and any such outer container can be blow molded from a corresponding preform.