How to Replace an Aluminum Screen on a Screen Door
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Pry the spline out of the groove on the back of the frame.
Use small pliers or a carpenter’s awl to pry the spline out of the groove. If the corners are tight, use a screwdriver to remove the spline. If the spline appears to be in good shape, set it aside for use with the new screen.
If the spline is brittle or cracked, you must replace it with a new spline (available at hardware stores).