This tiny bit of plastic lets you decrease the tilt you can apply to the camera on the Air65. This lets you fly slower and still see straight ahead. Weights under 0.1g, which is probably less than most of the other solutions like longer screws and zip ties. I printed mine in eSUN PETG+ and its lasted through many crashes and other mishaps.
I haven't actually tried the more tilt variant, I am happy with this amount of tilt personally, but included it in case anyone else prefers more.
The author marked this model as their own original creation.