Ngaba iirivethi zentloko ezifakwe kwi-countersunk zifuna imingxunya efakwe kwi-countersunk?

Ngaphambi kokusebenzisa i-rivet evulekileyo ye-countersunk head pull rivet, kuyimfuneko ukwenza umngxuma we-countersunk kwipleyiti kuqala, kungenjalo kuya kuba lula ukungalingani emva kwe-riveting.