This is a replacement damper for the rubber part that is originally installed in the Parrot Bebop2. These rubber dampers are very soft and might cause oscillations around the roll axis with alternate control software as the Paparazzi autopilot. I had good results printing them in PETG, but PLA might also work. The original dampers will give a better picture when operating the camera and absorb more energy in case of a mishap.
The wider opening of the damper goes into the metal body of the Bebop2, the narrow goes to the plastic cross and is secured with the washer.
There is a damper-tool that can be used to fasten the special metal screw nut.