Izici:
1. Ukulungiswa kwezinhlangothi ezintathu, qaphela ukulungisa ngezindlela eziyisithupha: ngaphambili nangemuva, phezulu naphansi, kwesokunxele nakwesokudla, ukuze igebe phakathi kweqabunga lomnyango nohlaka libe lihle kakhulu.
I-2.Insimbi engagqwali, umthamo oqinile wokuthwala
3.Ubukhulu bokuvula 180 degrees