E tele ituaiga o sikulima tu'ufa'atasi, e aofia ai fa'ailoga tu'ufa'atasi e lua ma fa'asili tu'ufa'atasi e tolu (fa'amafola mafolafola ma fufulu vaipuna po'o se fa'ameamea mafolafola tu'ufa'atasi ma fa'aputu vaipuna) e tusa ai ma le ituaiga o mea fa'aoga tu'ufa'atasi; E tusa ai ma le ituaiga ulu, e mafai foʻi ona vaevaeina i faʻamau faʻapipiʻi pan ulu, faʻamau faʻapipiʻi ulu ulu, faʻamau faʻamaʻi faʻamaʻi fafo, ma isi; E tusa ai ma meafaitino, ua vaevaeina i le carbon steel, stainless steel ma alloy steel (Vaega 12.9).