Here's a true story for shits and giggles.
So I shredded my original G310 gears, and as I opened the motor to install the replacement - surprise surprise, somebody at the factory forgot to put the third gear in:
Or maybe they did it for weight reduction? :) Less is more!
Mine arrived pretty bashed-up too. The parcel was clearly dropped and the axle pierced the packaging, damaging the thread in process. The nut wasn't going on very easily, but the axle itself was fine. So I forced it through couple of times, now it's OK. I did not file a claim.