I-screw ephambili ithatha uhlobo lwe-BM oluphezulu, kwaye imveliso ikhawuleza kwaye yenziwe ngeplastiki kakuhle.
Ubukhulu bodonga lweemveliso zemibhobho kulawulwa ngokuchanekileyo kwaye inkunkuma encinci kakhulu yezinto eziluhlaza.
I-tubular extrusion isikhunta esikhethekileyo, ifilimu yamanzi enesantya esiphezulu sokulinganisa umkhono, ixhotyiswe ngevalve yokulawula ukuhamba okudibeneyo kunye nesikali.