Use a screen spine tool to install the new spine around the frame securing the spline with the tool. The tool looks like a pizza or pastry cutter with a convex roller on one end and a concave roller on the opposite end. Use the convex end to press the screen into the groove of the frame. Use the concave end to press the spline into the groove. It helps to have someone hold the frame to keep the fabric taunt as you work your way around the frame.
Cut away the excess screening fabric with a utility or razor knife. Place the tip of the knife between the spline and the outside edge of the spline groove and pull the knife slowly along the groove around the perimeter of the screen.
Before reinstalling the screen door, remove all dirt and debris and spray silicone in the track so the frame will slide easily.
Replace the screen panel in the frame of the door carefully.
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