Izinhlobo zemihlahlandlela ye-PEGW yochungechunge lwe-lm zisho amabhola e-flange ephrofayili ephansi yohlobo lwegayidi yomugqa, u-S ubhekisela kumthwalo ophakathi nendawo futhi u-C usho umthamo osindayo, u-A usho ukukhweza ibhawudi ukusuka phezulu. Isilayidi somugqa wokungqubuzana okuphansi esiklanywe ngamabhola ensimbi emigqa emine esakhiweni se-arc groove esinamandla okulayisha aphezulu kuzo zonke izinkomba, ukuqina okuphezulu, ukuziqondanisa, kunganciphisa iphutha lokufakwa kwendawo ekhuphukayo, ama-bearings aphansi ahambisanayo asetshenziswa kabanzi kumishini emincane.