[villagetinker]

OP, contact the local SPCA (etc.) for a humane trap, hopefully you can trap the offending cat, take it to the local authorities, if the cat is chipped they will find the owner, if not it will probably go to s shelter. There is a very active cat club in the area that will probably correct me, but they will also have much more information and suggestions. As for your screen, there is a product called PET SCREEN which is used in lanais and birdcages (we have it in ours). This is a heavy duty screen product that greatly resists cats claws. It might be possible to have that installed on your screen (use the old frame, new Pet screen material and the correct size spline.