Kua noho matataki i te whakapai ki uta, ko ōna pūtahi whakapai pōkereke e hanga nei i ngā whakapai matatini, āheinga nui i runga i ngā mōhiotanga kapa. He whiwhi i a rātou i ngā tūranga whakawhiti kōpīna motokā, whakamahinga taputapu, me te mahi hoko ētronika, ka puta ake ngā pūtahi e āheinga ana i te wā whakapai me ngā whakahau herehere momori hei whakarite i ngā pūnaha. Ko ngā rangitaki pneumatic rānei, auau rānei e tiakina nei i te pai o ngā whakapai, me ngā kaiwhakarato haumaru hei tiaki i ngā kaiwhakatutuki i te wā mahi nui tonu.