It was Aveox way of fixing their rotor issue. But that is just a guess. The old school people would know more about this, as my first brushless setup was a Mamba Max system. I also posted pics of the dovetail looking rotor of the 1406 motor. I'm guessing Neumotors would know more about Aveox rotors.
6 KiloWatt A123 Racer
GTP-Pletty Big Maxximum+RX8. GTP-C50-6L Hacker+RX8. CRT.5-Pro4+ZTW esc.
24s2p EVG SX 49.6mph Ebike.
18s4p Raptor 60mph Ebike. 11.5KW