Answer
Ƙarshen Shim ɗin lebur ne, sassan madauwari a sama da ƙasa na maɓuɓɓugar ruwan juyi da yawa. Ana samun su ta hanyar rage tsayin igiyar ruwa zuwa sifili a ƙarshen coil. Ƙarshen Shim yana samar da filin tuntuɓar $360^\circ$, sabanin daidaitattun wavy ƙare waɗanda kawai ke tuntuɓar a kololuwa. Wannan yana da fa'ida ta hanyoyi guda biyu: na farko, yana rarraba kaya daidai gwargwado akan sashin mating, wanda ke da mahimmanci lokacin da aka yi ɓangaren mating da wani abu mai laushi kamar aluminum ko filastik wanda za'a iya 'notched' ta hanyar lodawa kololuwa. Na biyu, yana sauƙaƙa haɗuwa ta hanyar samar da tsayayyen tushe mai fa'ida wanda ke hana bazara daga karkatar yayin shigarwa. A cikin raƙuman sararin samaniya, ƙarewar shim yana tabbatar da cewa pre-load ɗin yana da kyau axial, yana hana juzu'i na parasitic ko rashin daidaituwa.
