Cad is brí le geansaí rivet dall?

Ceann léimneach an rivet dall: toisc nach bhfillfidh an rivet ceann an ingne, cuirfidh sé faoi deara go léimfidh an rivet ceann.

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