Umshini kawoyela ophindwe kabili we-crew ucezu lwemishini oluthuthukile olusetshenziswa ngokuyinhloko ekukhishweni kwamafutha adliwayo kumafutha eds. Idizayini nokusebenza kwayo kuthuthukisa kakhulu ukusebenza kwezinqubo zokukhipha uwoyela, ukuyenza ibe yithuluzi elibalulekile embonini yokudla kwezolimo. Ngokungafani nezindlela zendabuko zokukhishwa kukawoyela, umshini kawoyela ophindwe kabili usebenza kusetshenziswa indlela ye-screw emibili enikezela ngayo