Today, not being able to fly because of the wind....I wanted to check the balance again with unpowered gimble. When I first put my Gopro 3 white in the gimble, it seemed to balance fine. I did have a mishap on taking off and hit the mud on takeoff. No damage. Cleaned off mud. Today, put camera back into gimble. With no power, it wants to tilt to the right as I face the front of quad and camera. Put a 4.5 gram nut directly above the camera LCD screen and it balances fine. What can cause the change? Without camera mounted, the spring in rear motor assembly will flip the camera holder to my right. Can the spring lose tension that quickly? Don't think so.