1. Ukusetyenziswa kwelaphu elilukiweyo lentlanzi elilukiweyo eliphuma kumazwe angaphandle, elibhityileyo kwaye likhululekile, elilastiki ephezulu.
I-2.Ukusetyenziswa kweentsimbi ezine eziphezulu, zidlala indima exhasayo.
3.Uxinzelelo oluphindwe kabini, ukubonelela ngoxinzelelo olusebenzayo lwesisu, ngelixa likwazi ukukhusela isinqe asiwi.
I-4.Stable support strip, yomelele kwaye iqinile ukukhusela ukulimala ngexesha lokuzilolonga.