Di-grooved reducers di sebediswa bakeng sa dikgokelo tsa diphaephe tse nang le di-grooved, haholo-holo ho di-reducer tsa diphaephe, moo bohareng ba dipheletso tse pedi tsa diphaephe bo hokahantsweng moleng o le mong o otlolohileng, e leng se dumellang boholo ba phallo ho fetolwa.













