ʻO nā waiwai mechanical o kanā kalaiwaʻoi aku ka kiʻekiʻe ma mua o nā mea i hana ʻia ma ka hāmare. Hoʻonui kiʻekiʻe; emi metala poho; Hamarake kalaiwa anaʻO ka make i haku ʻia ʻelua ʻāpana o ka make luna a me lalo, ʻo ka mīkini hoʻopaʻapaʻa i haku ʻia me ka punch a ma ka hapa ʻelua o ka hui o ka huina o ʻekolu ʻāpana o ka cushion, no laila hiki ke hana i ka hāmare.hoʻohalahala ʻanahiki ole ke hana; ʻO ka nui pololei, ʻili maʻemaʻe.

Nā mea nui onā kalaiwahoʻolālā o ka paʻi paʻimake forging: Hoʻopaʻaʻaʻole pono e hoʻopilikia i ka ʻāpana concave o ka hoʻokaʻawale ʻana i ka make; E loaʻa kahi pali; Loaʻa nā kihi poepoe; No ka pale ʻana i ka forging ma ka ʻāpana longitudinal o ka ʻāpana ʻāʻī, pale ia i ke kahe metala; E pale i ka concave waena a me ka huelo liʻiliʻi; ʻO nā ʻāpana ʻāpana flange, ke like ka lōʻihi me ke anawaena o 10-12 mau manawa, ʻaʻole hiki ke ʻoi aku ka nui o ka flange ma mua o ka nui o ke kumu; ʻAʻole emi ka mānoanoa o ka pā o nā forgings perforated ma mua o 0.15 manawa anawaena.