Wotsogolera wapawiri wotsogolera nyongolotsi ndi gudumu la nyongolotsi ndi mtundu wa zida zomwe zimagwiritsidwa ntchito pofalitsa mphamvu. Zimapangidwa ndi nyongolotsi, yomwe imakhala ngati cylindrical chigawo chokhala ndi mano a helical, ndi gudumu la nyongolotsi, yomwe ndi giya yokhala ndi mano omwe amalumikizana ndi nyongolotsi.

Mawu akuti “dual lead” amatanthauza mfundo yakuti nyongolotsi ili ndi mano aŵiri, kapena ulusi, womwe umakulunga mozungulira silindayo mosiyanasiyana. Kapangidwe kameneka kamapereka chiŵerengero cha magiya apamwamba kwambiri poyerekeza ndi nyongolotsi imodzi yotsogolera, kutanthauza kuti gudumu la nyongolotsi lizizungulira nthawi zambiri pakusintha kwa nyongolotsi.

Ubwino wogwiritsa ntchito nyongolotsi ziwiri zotsogola ndi gudumu la nyongolotsi ndikuti zimatha kukwaniritsa chiwongolero chachikulu chamagetsi pamapangidwe ophatikizika, ndikupangitsa kuti ikhale yothandiza pakugwiritsa ntchito komwe malo ali ochepa. Kumadzitsekeranso pawokha, kutanthauza kuti nyongolotsi imatha kugwira gudumu la nyongolotsi pamalo ake popanda kufunikira brake kapena makina ena otsekera.

Mitundu iwiri yotsogolera nyongolotsi ndi magudumu a nyongolotsi imagwiritsidwa ntchito kwambiri pamakina ndi zida monga makina otumizira, zida zonyamulira, ndi zida zamakina.