With the glass and rubber laid in the opening, the string is carefully pulled through, enabling the rubber to wrap over the metal lip. Usually the glass is installed from the outside, pulling the string into the car, but the glass on the '46 installs from the inside, which made holding it fun. The garnish molding secures it in place. A second pair of hands is almost essential for this job, as you'll need someone to gently push the glass into place while you pull the string. Work across the bottom of the aperture, then up each side, then across the top, rather than attempting to pull the string from start to finish in one go. Although I didn't do it, many people find that coating the outside edge of the rubber with some dish soap will help it slide over the opening lip and prevent it from tearing.