1.Tshatisa iibhedi zasesibhedlele jikelele.
2.Umphezulu ogudileyo.
3.Yenziwe ngobunjineli bobunjineli obuphezulu bezinto zeplastiki ezinokuqina kwaye zomelele.
I-4.I-crank yesandla inokusongwa
3. Umsebenzi wokuzikhusela xa izikrufu zihambela phezulu.
I-4.Inkxaso edibeneyo yenziwe yamandla aphezulu ensimbi ye-alloy material, i-strudy kunye ne-burable.