He mahi tiaki haumaru te parepare, he whakapaipai i te waka, he whakapai ake hoki i ngā āhuatanga hauhautanga o te waka. Mō te haumaru, ka taea e ia te tiaki i te tinana o mua me muri o te waka mēnā ka pā mai he aituā tukinga tere iti, ā, ka taea hoki e ia te tiaki i te tinana o mua me muri; ka taea hoki e ia te tiaki i ngā kaihaerere mēnā ka pā mai he aituā ki ngā kaihaerere. Mō te āhua, he mea whakapaipai, ā, kua noho hei wāhanga nui hei whakapaipai i te āhua o ngā waka; I te wa ano, he pānga hauhautanga anō hoki tō te parepare waka.
I taua wā anō, hei whakaiti i te whara o ngā pāhihi i roto i ngā aituā taha, ka tāutahia ngā parepare tatau ki ngā motuka hei whakarei ake i te pānga ā-tukinga o ngā tatau. He tikanga whai hua, he māmā hoki tēnei, he iti noa ngā huringa ki te hanganga o te tinana, ā, kua whānuitia te whakamahinga. Mai anō i te Whakaaturanga Motuka o te Ao o Shenzhen i te tau 1993, i whakatuwherahia e Honda Accord tētahi wāhanga o te tatau hei whakaatu i te parepare tatau ki te hunga mātakitaki hei whakaatu i tōna mahi haumaru pai.