We began the final assembly by attaching the large chrome frame to the vertical upright with the two large Phillips-head screws. We placed the vent-window upper pivot pin in the chrome frame while carefully pulling the chrome frame up to meet the vertical metal frame. Bring the two frame halves together and attach them with the small Phillips-head screw at the top. As you can see here, there may be misalignment that will require some muscle to start that small screw. Once the small screw is in place securely (don't fully tighten it just yet), you can fasten the two larger screws at the bottom.