I am assuming ( and I apologize for that,) that when you say "close", you mean to get it to stay closed, because the battery is always flopping out upon impact; or perhaps yours is flying open during flight and causing a drag on the nose of the plane? Whichever. There should be a rubber ban attached to the inside of the canapy that keeps it closed. I have found that a simple solution to keep it closed is a small piece of brown packing tape, which is rather lighweight, but strong. I poked a small hole in the nose end of the canapy and tied a small rubber band there which I hook arounf the nose for extra security. hope this helps.