Cat flap for bug screen

My cat's like to use the balcony, but the bug screen tends to be in their way. I've designed this cat flap that can be mounted on your bug screen to allow your cats to enter/exit. While functional it also hides any screws to keep it visually appealing. It uses two 608zz bearings to allow the flap to swing smoothly and has place for two optional magnets (glue them in place) to help the flap stay closed. 9 self tapping 3x12 screws are required for mounting the cat flap on your bug screen (you could probably also use 9 M3x12 screws, but i haven't tested that). See the bill of materials for everything you need. I've added maker's supply magnets, but personally I've used magnets from some other store (so if they don't properly fit let me know!). You will also need a small sharp knife for cutting the screen, H2 bit/hex key/screwdriver and glue for mounting the magnets. Also: my bug screens use a thicker pet safe material, but I expect a regular screens to work jus