An gá an táirge a shuiteáil chun seamanna ceann cruinne a aslonnú?

Ní gá poill chomhthiomsaithe a phuncháil chun seamanna a tharraingt le cinn bhabhta aslonnaithe.

https://www.yukerivet.com/news/do-countersunk-head-rivets-require-countersunk-holes/