In this video, we learn how to replace the main gear on a Honey Bee King 3 helicopter. First, take the main blades off with a 2.5mm wrench. Remove the connectors, then remove the nut from the bottom gears and set it aside. Take out the gear and replace it with a new one. Screw it back into place, then make sure it's tightened. After this, you can place the blades back onto the helicopters and screw them into place. It will be hard to place some of the nuts back on, since they are located in small places, just use your fingers and tighten as much as you can.