Ingalo yokungasebenzi ixhasa isiphelo sekhonkco eliphakathi kwicala lomkhweli wesithuthi.Ingalo engasebenziyo ibolithi kwifreyim yesithuthi okanye isubframe.Ngokubanzi, ingalo engasebenziyo idityaniswe phakathi kwelinye icala lekhonkco eliphakathi ukusuka kwingalo yePitman kunye nesakhelo sesithuthi sokubamba ikhonkco eliphakathi kumphakamo ofanelekileyo.