Wat bedeit Blindniet-Jumper?

Blannniet-Sprangkapp: Well d'Niet den Nolkapp net ëmwéckelt, wäert et de Blannenniet-Sprangkapp verursaachen.

https://www.yukerivet.com/news/the-core-of-the-blind-rivet-is-not-completely-pulled-out-what-is-the-reason-for-the-fracture/