1. Rolling mold: Gaba ɗaya Hanyar mirgina mold shine a danna foda gilashin a cikin tabarma na gilashi. Kafin a naɗa bututun ƙarfe madaidaiciya madaidaiciya, tabarmar gilashin tana ɗaure tsakanin karfe da tsakiyar abin birgima, don yin kushin gilashin a tsakiyar. A ƙarƙashin tasirin rikice-rikice, ana kunna tasirin laushi mai kyau, kuma siffar gilashin gilashin da aka ƙera ya dace da siffar mazugi na mazugi na mirgina da ƙarshen karfe.

2. Drum da mandrel: Gilashin da aka yi amfani da shi don amfani da santsi na drum da mandrel yana da foda, tare da ƙananan barbashi da laushi mai yawa, sa'an nan kuma an rufe shi a kan rami na ciki da kuma waje na karfe. Har ila yau, yana yiwuwa a kunsa gilashin gilashin a kan farfajiyar waje na kayan ƙarfe da iska da gilashin gilashin gilashi a kan sandar mahimmanci.

3. Cire fim ɗin gilashin akan farfajiyar waje nakarfe bututu: Tun lokacin da aka yi amfani da madaidaicin gilashin gilashi lokacin mirgina, za a adana fim ɗin gilashin bakin ciki a ciki da waje na bututun ƙarfe da aka yi birgima. Wannan fim din daidai yake da gilashin talakawa, mai wuya da wuya. Crisp, wanda ke shafar kayayyaki bayan an yi amfani da shi, don haka dole ne a cire shi. Akwai hanyoyin inji da sinadarai don cirewa. Ana iya amfani da hanyar inji don harbin peening, sanyaya ruwa da mikewa da daidaitawa. Idan muka yi amfani da hanyoyin sinadarai don cire fim ɗin gilashi, duk mun san cewa sinadarai na gilashin suna da kyau sosai. Don haka, idan muka yi amfani da hanyoyin sinadarai, muna amfani da acid mai ƙarfi ko ruwa mai ƙarfi na alkaline. Sai dai kuma lalacewar hanyar da ake da ita ita ce, tana da gurbacewa sosai ga danyen bututun karfe daban-daban, wanda hakan na iya sa a tsinke saman bututun karfen, musamman na karfen carbon. Ba shi da tsada kuma bai dace ba a zaɓi tsinke shi kaɗai. Don haka a zamanin yau, an fi amfani da hanyar cire acid da alkali.