Nui nā ʻano ʻano huahana shaft, me ka pololei, cylindrical, spiral, convex, a concave shafts. ʻO ko lākou ʻano a me ka nui e pili ana i ka noi kikoʻī a me ka hana i makemake ʻia. Hoʻohana pinepine ʻia nā huahana shaft e hōʻoia i ka maʻalahi o ka ʻili a me ka pololei o ka dimensional, e ʻae iā lākou e hana paʻa i nā wikiwiki kiʻekiʻe o ka hoʻololi ʻana a i ʻole ma lalo o nā haʻahaʻa kiʻekiʻe.