Screw cap (200), loading piston (300), method for aligning screw cap (200) and loading piston (300) relative to each other and screw cap (200) on a threaded neck portion of a packaging container Method for screwing. The screw cap (200) comprises a base portion (210) comprising a top surface (212) and a bottom surface (214); and an annular portion (220) raised from the base portion (210), the inner surface (224) and the outer surface An annular portion (220) having (222); and at least one first threaded portion (252) disposed on an inner surface (222) of the annular portion, wherein the base portion (210) The engagement means (240), so that the screw cap (200) is at least one complementary engagement during the process of threading the cap onto a container having a complementary threaded neck portion. Configured to engage a tool (300) having means.
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