I cut both cables. The guide in the rear runner was movable but the front one seemed to be stuck. I wasnt fully sure if the window was supposed to be free when the cables were cut so I detached the vertical runners and managed to break the glass away from them and got it pushed up tight with a pce of wood. I couldn't see any of the pulleys or glides especially since the window was stuck down. Not really lookin forward to fittin the new regulator ( which i now need for sure ), but i figure i'd better eliminate the other possibilities.