Izibonelelo zokulungisa izinto kwi-shaft ngemijikelezo ejikelezileyo: Iyakwazi ukuvumelana kwe-axial ebalulekileyo kwaye kube lula ukudibanisa nokuhlanganisa; Isetyenziselwe iinxalenye kunye neebherings ezikude, kunokukuphepha ukusebenzisa imikhono emide, eyingenelo yokulungisa iinxalenye.