ʻO ke apo o loko a me ke apo o waho o kēia ʻano o nā bearings pōpō he ala heihei hohonu e hiki ke hoʻohana ʻia no ka lawe ʻana i nā ukana radial a me nā ʻāpana o nā ukana axial. hiki ke lawe ʻia i kahi o ke kiʻekiʻe kiʻekiʻe angular contact ball bearings.