Ndi mapangidwe awiri a bore cylindrical kapena tapered ndi retainers zopangidwa ndi chitsulo kapena ma resin opangidwa, ma bearing ndi ofanana ndi njira zawo zakunja zozungulira zomwe zimapangitsa kuti pakhale kusalingana mkati mwa 3° pakati pa mphete yamkati ndi mphete yakunja, kuti athetse zolakwika za concentricity ndi deflection.
