Once you put the glass back in the door, you have o tilt it back an forth with you are trying to get it to hook up to the regulator. Once you do get the regulator hooked up, roll the window all the way up, locking the glass in the closed position, then you can bolt in the window channels. Dont tighten them, as onec you get them in place, you run the window down, and snug the bolts so that the glass slides smoothly and freely, while maintaining being held in place.