Izizida za nyongolotsirZida zamagudumu a nyongolotsi zomwe zimagwiritsidwa ntchito m'boti. Zida 34CrNiMo6 za shaft ya nyongolotsi, mankhwala otentha: carburization 58-62HRC. Zida zamagudumu a nyongolotsi CuSn12Pb1 Tin Bronze. Zida zamagudumu a nyongolotsi, zomwe zimadziwikanso kuti shaft ya nyongolotsi, ndi mtundu wa makina a zida omwe amagwiritsidwa ntchito kwambiri m'boti. Zimapangidwa ndi nyongolotsi yozungulira (yomwe imadziwikanso kuti screw) ndi shaft ya nyongolotsi, yomwe ndi giya yozungulira yokhala ndi mano odulidwa mozungulira. Zida zamagudumu a nyongolotsi zimalumikizana ndi nyongolotsi, zomwe zimapangitsa kuti mphamvu ifalikire bwino komanso mopanda phokoso kuchokera ku shaft yolowera kupita ku shaft yotulutsa.
Mu maboti, magiya a wheel ya worm nthawi zambiri amagwiritsidwa ntchito kuchepetsa liwiro la propeller shaft. Giya la worm limachepetsa liwiro la input shaft, yomwe nthawi zambiri imalumikizidwa ku injini, ndipo imasamutsa mphamvu imeneyo.