He mahi ā ngā parepare hei tiaki i te haumaru, hei whakapaipai i te waka, hei whakapai ake hoki i ngā āhuatanga hauhautanga o te waka. Mai i te tirohanga haumaru, ina puta he aituā tukinga tere iti, ka taea e te waka te mahi hei ārai i ngā tinana o mua me muri o te waka; ka taea hoki e ia te mahi hei tiaki i ngā kaihaerere mēnā ka pā he aituā ki ngā kaihaerere. Mō te āhua, he mea whakapaipai, ā, kua noho hei wāhanga nui hei whakapaipai i te āhua o te waka; i te wā anō, he pānga hauhautanga anō hoki tō te parepare waka.
I taua wā anō, hei whakaiti i te whara o ngā kainoho o te motuka mēnā ka pā mai he aituā tukinga taha, ka tāutahia he parepare tatau ki runga i te motuka hei whakapakari i te kaha o te pānga o te tatau o te motuka ki te tukinga. He tikanga whai hua tēnei, he māmā noa iho, ā, he iti noa iho ngā panoni ki te hanganga o te tinana, ā, kua whānuitia te whakamahinga. Ko te tāutanga o te parepare tatau he whakanoho i ētahi kurupae maitai kaha-kaha ki roto i te pane tatau o ia tatau, e mahi ana i te mahi a ngā parepare o mua me muri o te motuka, kia "tiaki" ai ngā parepare o mua, o muri, o maui, me te taha matau o te motuka katoa, e hanga ana i tētahi "taiepa parahi", kia nui ai te wāhi haumaru o ngā kainoho o te motuka. Ko te tikanga, mā te tāuta i tēnei momo parepare tatau ka piki ake ētahi utu mō ngā kaihanga motuka, engari mō ngā kainoho o te motuka, ka nui ake te haumaru me te wairua haumaru.