Using lateral physical modulation, the optical properties of VCSELs can be stabilized and controlled by spatially varying the characteristics of the device material. The internal thread of the threaded sleeve facing the worm shaft of the extruder and the associated external thread of the coupling sleeve have recesses allowing the threaded sleeve and the coupling sleeve to be connected in the manner of a bayonet fixing. A commodity is dispensed within the plastic container. The continuous portion is larger in thickness than the metal plate. Attached to the base are the electronic and the mechanical component necessary to provide the required positional and event outputs to a computer.