Ibicuruzwa
Imirongo imwe inguni ihuza imipira irashobora kwakira imitwaro ya axial mu cyerekezo kimwe gusa.Ibikoresho bifite aho bihurira na 30 ° (A) cyangwa 40 ° (B) mubisanzwe bikoresha ibyuma bikanda, ibisigazwa byabumbwe, cyangwa imashini zikozwe mu muringa, nubwo imashini ikozwe munganda cyangwa imashini yihariye ya polyamide ikoreshwa mubisabwa bimwe.