Dulani ndi kupinda chubu cha mkuwa kuti chikhale cholimba pogwiritsa ntchito Hairpin Bender ndi Tube Cutting Machine, kenako gwiritsani ntchito chingwe chosindikizira fin kuti mumenyetse zojambulazo za aluminiyamu m'zipsepse. Kenako lumikizani chubucho, lolani chubu cha mkuwa chidutse m'bowo la fin, kenako kulitsani chubucho kuti ziwirizo zigwirizane bwino ndi vertical expander kapena horizontal expander. Kenako sungunulani mawonekedwe a chubu cha mkuwa, dinani kuti muwone ngati pali kutuluka madzi, sonkhanitsani bulaketi, ndikuyika phukusi mutadutsa mayeso a khalidwe.