DO NOT put a 60 inch deck on your 520-H no matter how bad you wanna, it will snap the frame right behind motor mounts and cost alot of time and money to repair with out knowledge and proper equipment, i spent half of yesterday and today reinforcing the angle iron frame FOR THE 2ND time(I was not the one who fixed it the first time) fixing the large sag in one from the angle iron snapping. About $400 in repairs.