In the process of removing the cover of my vision plus I'm afraid I stripped one of the screws. I was able to get it off but I'm afraid to put it back on. Does anyone know the exact size of the small screw that is at the very tip of each arm under the motor? Also what size screwdriver should I use for that screw? I know they sell entire screw packs for the phantom but I don't need all those other extra screws and would rather just go to Home Depot to pick up the necessary screws. Thanks.