https://fakenews.win/wiki/Cat_....Flap_Installer_Near_
It can be difficult to install a cat flap however, with the proper instructions it's not that hard. Find out how high you'd like your cat flap to be (normally, it is at belly height). Note this on your door and use the template provided to guide you when drilling. If you have a kitten who is still a baby, gently prop the door slightly open and invite it to walk through. Reward the kitten as it moves through. Take a measurement of the door A cat flap is an excellent way to allow your pet to leave and come inside and out of your home w