Tapahia, whakapikoa hoki te ngongo parahi kia rite te āhua mā te Hairpin Bender and Tube Cutting Machine, kātahi ka whakamahia te aho pēhi whiri hei wero i te pepa konumohe ki roto i ngā whiri. Muri iho, mirohia te ngongo, tukua te ngongo parahi kia puta mā te kōhao whiri, kātahi ka whakawhanuitia te ngongo kia piri pai ai ngā mea e rua mā te whakamahi i te whakawhanui poutū, i te whakawhanui whakapae rānei. Kātahi ka whakarewahia te hononga o te ngongo parahi, pēhia hei tirotiro mō ngā turuturu, huihuia te whāriki, ka takai i muri i te tirotiro kounga.