1, kia maeneene me te maeneene, kaore he kapiti, he taha koi me te wera me etahi atu hapa, ka taea te arotake i te whakamahinga o te karaihe whakanui me etahi atu waahanga.

2, herea ki te whawhati i te kawenga haumaru rite te kawenga whakamātautau ki te whakamatautau. Ko te titi o te rakau kia kaua e pakaru tonu te ahua me te waatea ki te huri i muri i te wewete. Ko te roa o te roa o te tinana kia kaua e neke ake i te O.25%, O.5mm ranei. 300 tons o te 2 wa e whai ake nei te kawenga haumaru hei kawenga whakamatautau ki te whakamatautau, neke atu i te 300 tons o te 1.33 wa te kawenga haumaru hei kawenga whakamatautau ki te whakamatautau.

3, ka taea e te mekameka te whakamatautau i te pono. Ko te kawenga he rua te kawenga whakamatautau. Kaua e pakaru te mekameka, ka pakaru ranei te maru.

4, ko te whakamahi i te maru o te kawenga haumaru he M (4) kua whakaaetia.

5, i roto i te tinana pātene kia tohua ki te taumata kaha, kawenga haumaru me etahi atu tohu.