I just finished installing all new glass & weather stripping in our car. There are three studs with lock nuts, two up top and one on the bottom. The end of the stud has a slot for a flat head screw driver. Turning in/out will adjust the angle of the window. Moving the window for or aft in the slots will adjust for the gaps. Because I did al the glass, I had to adjust the front door window as well. Working both at the same time to get the correct gap.