I ka ʻoihana hana, nā mea hoʻopaʻa i nā mea nui no ka hoʻopili ʻana a me ka hoʻoponopono ʻana i nā ʻāpana. He ʻano like ʻole lākou a he mau hana like ʻole. Mai nā bolts, nuts, screws, a rivets, washers, retaining rings, pins, etc. Eia naʻe, i mua o ka nui o nā koho, he mea nui e hōʻoia i ka hiki i nā mea hoʻopaʻa koho ke hoʻokō i nā pono o nā kūlana hana kūikawā.