Hoʻokō nā pōpō kila kila i nā koi no kahi pōpō paʻakikī ʻole me ka paʻakikī maikaʻi loa a me ke kūʻē ʻana i ka pala. Hiki ke hoʻonui ʻia ke kūʻē ʻana i ka pala ma o ka annealing. Hoʻohana nui ʻia nā pōpō ʻaʻole i annealed a me nā pōpō annealed i nā valves a me nā lako e pili ana.
