It was surprisingly easy to remove the old frame and replace it with the new one. All you need is a small flat head screwdriver to loosen the small metal clip on the old post. The new toothed rack engages with manual force. The whole process took about fifteen seconds. I wish every repair was that easy! The new rack is so powerful that I only replaced one. I keep the other one in reserve. If both are replaced, the door/window will open with too much force.