Ko te raupapa TND/svc he pūnaha whakahaere ngaohiko aunoa kei roto ko te whakawhiti aunoa whakapā, te motuka servo, te ara iahiko whakahaere aunoa me ētahi atu. Ina kore pumau te ngaohiko whatunga, ka tukuna aunoatia he tohu e te ara iahiko whakahaere tauira hei taraiwa i te motuka servo, hei whakatika i te tūranga o te pūnaha whakahaere ngaohiko honohono-whaiaro mō te paraihe waro, kia eke ai te whakatauranga ngaohiko putanga ki te āhua pumau. He hua tēnei e kore e whakapohehe i te āhua ngaru, he mahi pono. He mahi roa me ētahi atu āhuatanga, he whakaroa wā, he mahi tiaki ngaohiko nui, he mahi tiaki ngaohiko iti. Ka taea te whakamahi whānui i roto i te hiko e hiahia ana ki te ngaohiko pumau, he momo pai rawa atu te tuku ngaohiko pumau. Me whakarite kia mahi noa ngā taputapu hiko.