A na-etinye ntọhapụ clutch n'etiti njigide na nnyefe.A na-ekpuchi oche oche ntọhapụ nke ọma na mgbatị tubular nke mkpuchi mkpuchi nke ogwe mbụ nke nnyefe.Site na nloghachi mmiri, ubu nke ntọhapụ na-emegide ndụdụ ntọhapụ mgbe niile wee laghachi n'ọnọdụ ikpeazụ, na-ejigide nkwụsị nke ihe dịka 3 ~ 4mm na njedebe nke ntọhapụ ntọhapụ (mkpịsị aka).