Ko ngā peera roera whakarara e whakamahia whānuitia ana hei tautoko i te kawenga whakakotahi, ko te nuinga he kawenga radial. Ka taea te wehewehe i ō rātou kapu kia māmā ai te huihui. I te wā e whakairihia ana, e whakamahia ana hoki, ka taea te whakarite i te ātea radial me te ātea axial, ā, ka taea te whakairi i mua i te utaina.
