https://www.openlearning.com/u..../princebro-smglhe/bl
https://aguirre-hess-2.thought....lanes.net/installing
A professional cat flap fitter will install your pet door inside a door or in the wall. The wall-mounted version is more secure, because an intruder won't be able to get through. It also reduces energy costs and helps to prevent draughts. The Tasker will mark the location where the cat flap is inside your door, and then drill out the corners. They will also sand down the edges of the frame to give it a smooth surface. M