Umsebenzi wokusekela i-arch ovundlile: ukwandisa amandla onyawo oluthwala amandla futhi unciphisa ukucindezeleka ngokweqile.Idizayini yokunyakaza kwehinge: iqinisa kahle futhi isekele ukunyakaza kwamahhala kwelunga lesithupha.Ukulungiswa Kwesimo Semvelo: namathisela onyaweni, vikela amalunga onyawo, gcina isithupha endaweni yaso yemvelo, ukuma okuphelele futhi uvimbele izifo zezinyawo.
