Did you mean "opening"? If it hits hard "Opening" it's the Roof Struts that need replacing! No big Deal. If you did mean "Closing" I have no idea. You will have to wait for smarter than me to respond!Roof works fine, goes up and down, When closing it seems to bottom out hard. If I moved up the bottom latch in storage area would that help. It has creased the bottom cushion and split the material.