A fastener for components of a motor vehicle includes a tubular rivet, with a rivet head and a shank, wherein the shank has at least two longitudinal slits, between which lugs which can deflect in an elastically rebounding manner. An aliquot of a body serum is subjected to separation forces may be fluid drag and electrophoretic force in opposition. As such, the controller prevents a welding output until an open condition followed by a short condition at the welding area is detected. Structured elements having a predetermined maximum dimension are positioned in the device to control the predetermined distance between the first and second electrodes. The communication module and corresponding portable terminal are able to ensure the integrality and stability of data. When the force is released, the elastic portion snaps back, often resulting in a sling-shot effect dislodging the sinker.