Parrot AR.Drone Replacement Gear with Shaft Set
The gears and their shafts link the motors to the propellers.  This kit includes 4 gears (high resistance plastic), 4 stainless steel shafts and 8 circlips. For an easy mounting, a special circlip tool is available in the “mounting tools kit” to easily insert and remove the circlips which hold the propellers and the gear on the shaft.