1. Igikonoshwa cyimashini gikoresha irangi ryo guteka, ryiza kandi ryiza;
2.Fixture, ikadiri igendanwa ikozwe mubyuma bidafite ingese, ntizigera ingese;
3.Ikibaho gikozwe mubintu bidasanzwe bya aluminiyumu, urufunguzo rwicyuma, imikorere yoroheje, ntabwo byoroshye kwangiza;