After having forgotten to remove the camera cover a couple of times when I powered on the TH, I made a simple reminder (like a string around your finger or a "Remove Before Flight" flag. I simply tied a piece of string to the camera cover and tied the other end to a strip of velcro. After I install the camera cover after flight, I wrap the velcro strip around one of the motor arms. That way next time, I can't raise the motor arm without remembering to remove the camera cover. This is important because the gimbal motor will get real hot if the cover is not removed and the copter is powered up.