Nke aikpuru gearotu gia wiil ikpuru nke e ji mee ihe n'ụgbọ mmiri. Ihe 34CrNiMo6 maka ogwe ikpuru, ọgwụgwọ okpomọkụ: kaburization 58-62HRC. Ihe gia worm CuSn12Pb1 Tin Bronze. Gia wiil ikpuru, nke a makwaara dị ka gia worm, bụ ụdị sistemụ gia a na-ejikarị eme ihe n'ụgbọ mmiri. Ejiri ikpuru silinda (a makwaara dị ka skru) na wiil ikpuru mee ya, nke bụ gia silinda nke e bepụrụ ezé n'ụdị helical. Gia ikpuru na-ejikọta ya na ikpuru ahụ, na-emepụta nnyefe ike dị nro na nke dị jụụ site na ogwe ntinye gaa na ogwe mmepụta.
N'ime ụgbọ mmiri, a na-ejikarị gia wiil worm eme ihe iji belata ọsọ nke shaft propeller. Gia worm na-ebelata ọsọ nke shaft ntinye, nke a na-ejikọkarị na injin, ma na-ebufe ike ahụ.