PEGW jerin lm jagororin nau'ikan suna nufin ƙananan ƙirar ƙwallon ƙafa irin nau'in jagorar madaidaiciya, S yana nufin matsakaicin nauyi kuma C yana nufin ƙarfin ɗaukar nauyi, A yana nufin hawan kulle daga sama. Low gogayya mikakke nunin faifai tsara tare da hudu jere karfe bukukuwa a arc tsagi tsarin wanda yana da high load iya aiki a duk kwatance, high rigidity, kai aligning, iya rage shigarwa kuskure na hawa surface, low gogayya mikakke bearings suna yadu amfani ga kananan kayan aiki.