Ubwino wokhazikitsa zigawo za shaft ndi mtedza wozungulira: amatha kukhala ndi mphamvu zazikuluzikulu komanso zosavuta kusokoneza ndikusonkhana; Ntchito zigawo ndi zigawo zomwe zili kutali, zimatha kupewa kugwiritsa ntchito manja akuluakulu, omwe amakhala opindulitsa pokonza ziwalozo.
p>Mchere wozungulira nthawi zambiri umaphatikizidwa ndi kuyimitsa maheli a mtedza wozungulira. Pa msonkhano, ikani lilime lamkati la isher pa starove pa shaft, ndikuyika lilime lakunja la madzi ozungulira kuti mutseke nati; Kapenanso, mtedza wachiwiri ungagwiritsidwe ntchito popewa kumasula.