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self pobowola screw ndi mapiko
Posonkhanitsa matabwa pazitsulo, bowo lamatabwa limafunika kukhala ndi malo ena kuti asapitirire, matabwa asanayambe kubowola pamzerewu, The Self-Drilling point imabowola chitsulo pamene nsonga za mapiko zimapanga bowo loyendetsa ndege. Kudzera muzitsulo, Apo ayi nsonga yobowolayo ikhoza kuwotchedwa, matabwa, kusweka kapena chingwe chokonzera matabwa osamangidwa.Ntchito 1: Mapiko onse awiri amapewa matabwa kuti awonongeke poboola dzenje loyendetsa ndege.Ndi nthiti pansi pamutu zomwe zinamiza nkhuni ...
