Umtshini we-25kg ozenzekelayo wokufaka isikhwama usebenzisa i-screw feeding enye ethe nkqo, eyenziwe sisikrufu esinye. I-screw iqhutywa ngokuthe ngqo yi-servo motor ukuqinisekisa isantya kunye nokuchaneka komlinganiselo. Xa usebenza, i-screw ijikeleza kwaye isondle ngokuhambelana nomqondiso wokulawula; inzwa yokulinganisa kunye nenkqubo yomlawuli wokulinganisa umqondiso wokulinganisa, kwaye ikhupha umboniso wedatha yobunzima kunye nomqondiso wokulawula.