Mphepete mwa nyongolotsi, yomwe imadziwikanso kuti screw worm, ndi chipangizo chomwe chimagwiritsidwa ntchito kusuntha kuzungulira pakati pa ma shaft awiri osafanana. Amakhala ndi ndodo ya cylindrical yokhala ndi poyambira kapena ulusi pamwamba pake. Komano, giya ya nyongolotsi, ndi mtundu wa giya womwe umafanana ndi wononga, wokhala ndi m'mphepete mwa mano omwe amalumikizana ndi mphuno yozungulira ya shaft ya nyongolotsi kuti asamutsire mphamvu.
Mphepete mwa nyongolotsiyo ikazungulira, pozungulira pozungulirapo amasuntha zida za nyongolotsi, zomwe zimayendetsa makina olumikizidwa. Makinawa amapereka ma torque apamwamba kwambiri, ndikupangitsa kuti ikhale yabwino kwa ntchito zomwe zimafunikira kuyenda kwamphamvu komanso pang'onopang'ono, monga zamakina aulimi.
Ubwino umodzi wogwiritsa ntchito shaft ya nyongolotsi ndi zida za nyongolotsi mu gearbox yaulimi ndikutha kuchepetsa phokoso ndi kugwedezeka. Izi ndichifukwa cha mapangidwe apadera omwe amalola kuti makina aziyenda bwino komanso ngakhale kuyenda. Izi zimapangitsa kuti makinawo asawonongeke kwambiri, kuonjezera moyo wake komanso kuchepetsa ndalama zolipirira.
Ubwino wina ndi kuthekera kwawo kuwonjezera mphamvu kufala kwachangu. Mbali ya spiral groove pa shaft ya nyongolotsi imatsimikizira kuchuluka kwa magiya, zomwe zikutanthauza kuti makinawo amatha kupangidwa mwachindunji kuti alole kuthamanga kwina kapena kutulutsa kwa torque. Kuchita bwino kumeneku kumapangitsa kuti mafuta azichulukirachulukira komanso kuchepetsa kugwiritsa ntchito mphamvu, zomwe zimapangitsa kuti pakhale ndalama zambiri.
Pomaliza, kugwiritsa ntchito shaft ya nyongolotsi ndi zida za nyongolotsi mu gearbox yaulimi kumatenga gawo lofunikira pamakina aulimi aluso. Mapangidwe awo apadera amalola kugwira ntchito mwakachetechete komanso kosalala kwinaku akupereka mphamvu zowonjezera zotumizira mphamvu, zomwe zimapangitsa kuti pakhale ntchito yaulimi yokhazikika komanso yopindulitsa.
