He aha i whati ai te mandrel i ngā rivet matapo, kaua i te pūwāhi whati o te titi kume? Au

1. Kāore i te pumau te kaha kukume o te mandrel tonu, he tata rawa te kaha pakaru ki te kaha kukume o te mandrel tonu, kāore rānei i oti te maimoatanga wera, ā, he pakarukaru te mandrel.

2. Kua pakaru te mandrel i mua i te whakakī.

https://www.yukerivet.com/news/the-mandrel-of-the-rivet-has-been-completely-pulled-out-is-it-qualified-to-leave-a-penetrating-hole-in-the-rivet-body-after-riveting/