Isi ihe dị n'ime ihe mkpuchi ahụ adọpụtaghị kpamkpam, gịnị kpatara mgbawa ahụ?Ⅱ

3. Isi ntu ahụ na-ada: Mgbe e tinyere ya n'ime mmiri, a pụghị ikechi isi mandrel ahụ ma si n'ahụ rivet ahụ daa.

4. Mkpọwa ahụ na-agbawa agbawa: Mgbe ọ dọwara riveting ahụ, ahụ na-agbawa agbawa nwere mgbawa ogologo ma ọ bụ gbawara agbawa kpamkpam.

https://www.yukerivet.com/news/the-nail-cap-came-off-what-is-the-reason/