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Introduce your cat to the flap prior to when it's put in place so that they be familiar with the size and shape. Unlock the flap and let your cat explore it from every angle. Make sure that the cut-out is even and ensure that the cut-out is square and even. Mark the screw holes and align them with the cat flap opening. The distance between the edges must be equal. Preparation Installing a cat flap at home can be beneficial t