Lay the sash panel down on its side so that you can see the screw holes on the sides by the flap.
Step 2Remove Screws
Remove the two screws nearest to the side of the flap on both the top and bottom using the Phillips head screwdriver and the electric drill.
Step 3Remove Side Piece
Slide out the side piece so that you can access the rod at the top of the flap.
Step 4Remove Retainer Ring
If you have retainer rings, you will need to loosen the middle set of screws and remove the entire flap and frame assembly from the unit. Then you can pop one ring off using the flat head screwdriver.
If there is not a ring, instead of loosening screws and removing the flap frame assembly you can keep the assembly in place and slide just the rod out towards you to remove the flap.
Step 5Remove Old Flap
Remove the old flap.
Position the new flap in place in the frame and make sure the magnets are attracting correctly. If they are not, try flipping the flap around (switching the interior and exterior faces).
Step 6Stretch the Bellows
Sometimes the bellows (accordion-like sides of the flap) contract during shipping and prevent the magnets from attracting.
To fix this, remove the pivot washers from the top corners of the flap and use a blow dryer to lightly heat the bellows and stretch them back out.
Step 7Position the New Flap
Slide the rod back through the top of the flap.
Step 8Re-Install Flap Assembly
If you removed the entire flap and frame assembly and one of the retainer rings, install a new retainer ring with the teeth pointing out away from the flap and slide the entire assembly back into place.
Be sure that the tracks for the locking cover are on the same side as the width adjustment locks at the other end.
Step 9Re-Install Side Piece
Screw the side piece that holds the flap assembly back in place with the two screws that you removed. If you loosened screws in the middle to remove the flap frame, tighten them back down.
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