If you need a reference for the Secret Screen parts, click here Main installation instructions are here. Tools you will need to install Secret Screen: 1) a medium size phillips head screw driver, or preferrably a drill with a phillips head bit; 2) a hammer; 3) a pencil. Step 1 - Install Screen Main Housing (Figure 1) Install screen to top of jamb as per main instructions.   Make sure screen is mounted far enough from door to pull down outside the double door center style. Step 2 - Adjust Extensible Hook to Correct Length (Figure 2) Pull screen down a few inches and measure from screen to face of door.   Make sure it is out from door the same distance as the screen at top.   It should also be approximately the same depth as the hold-down hook is on the door frame.   Now use the nuts and bolts to fix the parts together firmly at this depth. IMPORTANT - To reach the minimum depth, it will be necessary to cut the parts at the notches found in the center of the slide.   This can be done with an ordinary hacksaw.   If needed, we can send cut down parts for you. Step 3 - Attach the Extensible Hook to the Door (Figure 3) Pull the screen down and hook it into the hold-down hook on the jamb side of the doorway as per main instructions. Now, holding the fully assembled extensible hold-down hook firmly, hook the screen into it and slide it down until the screen material is evenly tight on both sides.   Also make sure the pins on both sides are holding the pegs on the ends of the bottom bar almost totally, but not too tightly.   Now mark the middle of the wood screw holes on the door with a pencil. Attach the assembled extensible screen hook to the door using the provided wood screws at the marks you have just made with the pencil. Check that the screen is adequately taut on both sides and hooked securely when the bottom bar is moved all the way to either side.   Adjust the tension as necessary (directions for this are found on main instructions).