Due to building works we had to install a catflap quickly without the time to train the cats how to use it. It has now been several months of the flap being taped open and the cats going through freely. It has been set up with their chips so they are used to the unlocking click noise it makes when their head is near. However we now need to close it and have no idea how to get the cats to push the flap themselves! Does anyone have any tips?