ʻO ka lāʻau hollow he ʻāpana cylindrical me kahi kikowaena puhaka, ʻo ia hoʻi he puka a i ʻole ka hakahaka e holo ana ma kona axis waena. Hoʻohana mau ʻia kēia mau shafts i nā noi mechanical like ʻole kahi e koi ʻia ai kahi mea māmā akā ikaika. Hāʻawi lākou i nā pono e like me ka hoʻemi ʻana i ke kaumaha, hoʻomaikaʻi maikaʻi ʻana, a me ka hiki ke hoʻopaʻa i nā mea ʻē aʻe e like me nā uea a i ʻole nā kahawai wai i loko o ke kumu.
