Ko te mīhini hanga roera hanganga he taputapu e whakamahia ana i roto i te hangahanga hei whakaputa i ngā hanganga rino roa, nui te rahinga me ngā wāhanga whakawhiti motuhake. Kei roto i tēnei ko ngā awa whakarewa, ngā koki, ngā kurupae-I me ētahi atu kōtaha e whakamahia ana i roto i te hanganga whare, ngā kaupapa hanganga me ētahi atu tono. Ka mahi te mīhini mā te piko haere me te hanga i tētahi rīpene rino, i tētahi koiri rānei ki te āhua wāhanga whakawhiti e hiahiatia ana mā te tuku i roto i tētahi raupapa roera kua hangaia kia tika hei whiwhi i te kōtaha e hiahiatia ana. Ko te hua whakamutunga he roa tonu o te rino ka taea te tapahi kia rite ki te rahi mō ngā tono hanganga maha.
1. He whānuitia te whakamahinga o ngā hua e hangaia ana e tēnei mīhini hei tautoko me te pūnaha whakairi, ka taea te whakakotahi me te hanganga maitai, te hanganga raima, me ētahi atu hanganga rānei i roto i te tere me te whai hua. He tere, he watea hoki te whakatika i ngā paipa, he tino pai te tautoko i ngā paipa hau me ngā piriti me ētahi atu tukanga tāutanga.
2. He pai tēnei mīhini hanga rōra mō te whakakapi ā-ringa i ngā momo kāri mangere, te hanga i ngā kōtaha tautoko 41*21,41* 41,41 *52,41* 62,41 *72. Ka whakamahia e te kōtaha whakatakotoranga he rōra topenga, e penapena ana i te wā o te whakatikatika rōra me te patuiro, ā, he watea hoki mō ngā kaiwhakahaere noa ki te whakahaere.