Larson storm doors come with an optional retractable screen. Unlike other screens, the Larson retractable screen rolls up into a cassette at the top of your door to keep it safe when not in use. If your screen is damaged you can replace it with a new screen by replacing the cassette and screen. You'll need to order the parts from Larson.
Use the screwdriver to loosen the screws on the screen assembly cover at the top of the Larson storm door. Remove the cover from the door.
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Lift the screen roll from the door. Push up on the screen roll and it will come off of the door.
Fit the new screen roll onto the door and pull down to snap it in place.
Place the screen assembly cover over the screen roll and screw it in place.