If you don't have anything mounted to the hatch to tie it down you can use the existing latch for that purpose. A piece of wire works great. Just push the wire into the latch until it locks then pull the hatch down and tie the other end around the lock striker on the bottom of the hatch opening. If you are using a piece of rope or twine, you can use a screwdriver to push the latch closed. To undo, just push the hatch release and the wire/rope will pull out of the lock (resetting it) and then remove the other end from the striker. If for some reason the wire or rope broke when inside the lock it can be easily reset pushing the hatch release before closing the hatch.