Okuizixhobo zemibungurIseti yezixhobo zevili leempethu ezazisetyenziswa emkhombeni. Izinto ezisetyenzisiweyo yi-34CrNiMo6 kwi-worm shaft, unyango lobushushu: i-carburization 58-62HRC. Izixhobo zezixhobo zempethu i-CuSn12Pb1 Tin Bronze. Izixhobo zezixhobo zevili leempethu, ezaziwa ngokuba yi-worm gear, luhlobo lwenkqubo yezixhobo ezisetyenziswa rhoqo kwiinqanawa. Zenziwe yi-worm cylindrical (ekwaziwa ngokuba yi-screw) kunye ne-worm wheel, eyi-cylindrical gear enamazinyo asikiweyo ngendlela ye-helical. Izixhobo ze-worm zidibana ne-worm, nto leyo eyenza ukudluliselwa kwamandla okuthe tye nokuzolileyo ukusuka kwi-input shaft ukuya kwi-output shaft.
Kwiinqanawa, iigiya zamavili ezirhubuluzi zihlala zisetyenziselwa ukunciphisa isantya se-propeller shaft. Igiya lezirhubuluzi linciphisa isantya se-input shaft, edla ngokuqhagamshelwa kwinjini, kwaye lidlulisela loo mandla.