Amawasha erabha ahlala phakathi kwe-fastener nendawo yaso ukuze aqinisekise ukusatshalaliswa kwesisindo esilinganayo futhi avikele indawo engaphezulu ekudlidlizeni nasekungqubuzaneni.Nakuba amawasha angahluka ngogqinsi, umumo, kanye nokuminyana, ngokuvamile athatha uhlobo lwamasongo enjoloba aqinile anembobo emaphakathi yesixhumi.