Abstract: The assembly is characterized by a plurality of ejectors (32) each including a stationary portion (34) immovably mounted on the base (22) by screws and an actuatable portion (36) extending through the mold (20). Each ejector (32) is independently actuatable for ejecting the part (24) from the shaping surface of the mold (20). Both the mold (20) and the ejectors (32) are attached to the base (22) and do not move relative to the base (22) during the molding process and only the mold (20) includes cooling passages (54) whereby molds (20) substituted for one another and the ejectors (32) arranged in different configurations to accommodate the respective molds (20).