Kune mhando dzakawanda dzesimbi isina tsvina, uye mutengo wakasiyana wakakurawo. Kubva pakuona kwemaitiro ekugadzira, kune marudzi eplate, mhando dzekukanda, uye marudzi efogi. Kazhinji, mhando dzemahwendefa dzakachipa, nekuti mazhinji esimbi isina tsvina mahwendefa ari Iyo yakawanda-inogadzirwa, uye mutengo wakaderera. Mutengo wekukanda unosiyana zvichienderana nekuoma kwechimiro. Forgings inogadziriswa pahwaro hwesimbi isina tsvina ingots, saka mutengo wakakwira kupfuura iwo weakajairwa simbi isina tsvina.

Simbi isina tsvina Thimbles inowanzoshandiswa mukuvaka dzimba dzepasi kudzivirira mapaipi kana mhete dzesimbi dzinofambisa kuiswa kwepombi.

Kukamurwa kwecasing: Rigid casing, inochinjika isina mvura casing, simbi chubhu casing, uye simbi casing.