Am feum an toradh a bhith air a chuir an aghaidh a chèile gus na sguaban cinn cruinn fhalmhachadh?

Chan eil e riatanach tuill a phutadh gus na sguaban a tharraing le cinn cruinn falamh.

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