Umshini uguqulwa ukuze uvumelanise isikhumba esinzima futhi esithambile kubukhulu obudingekayo embonini yemikhiqizo yesikhumba, ububanzi bawo bungu-420mm nobukhulu bawo-8mm. Kunganciphisa ukuguqula ubukhulu bokuhlukaniswa kwezicucu ukuze kuthuthukiswe ikhwalithi yemikhiqizo namandla okuncintisana kwezimakethe.