Incazelo emfushane:
Okokuqala, kufanelekile ukusetshenziswa: zonke izinhlobo zama-engeli ku-18-62mm valve zingasetshenziswa;Ipuleti lensimbi ozikhethela Isibili, ukubumba: ubuso obusebenzayo kanye ne-chamfering ephezulu nephansi yokucubungula;Okwesithathu, akukho ukugaya: indandatho yesihlalo se-valve ngemuva kokucubungula ngokuvamile ayidingi ukugaya, ingasetshenziswa ngokuqondile ne-valve entsha;Okwesine, ukuma okunembile: qinisekisa ukuthi isihlalo se-valve sisebenza nge-Angle, indawo ephezulu...