My daughter and I are painting and reglazing the windows in her c1939 home. I removed the bottom sash by taking off the stops and removing the two screws on one side and taking out the aluminum strip. The window was easy to get out. However, the top window is more of a problem. Can't locate the stop to remove. Is it on the outside and how do I remove it? Any help will be appreciated since the house has 15 windows and all are in need of reglazing and painting.