He ara rere ā-roto, ā-waho hoki ngā porowhita pōro whakapā koki e nekehia ana tetahi ki tetahi i te ahunga o te tuaka o te porowhita. Nō reira, he pai ngā porowhita mō ngā kawenga radial me te tuaka e mahi tahi ana. Ka piki ake te kaha kawe kawenga tuaka o ngā porowhita pōro whakapā koki i te pikinga o te koki o te porowhita.
