Recieved my Neu

I just recieved my Neu 1515/2.5D I will run on a 6 cell lipo ( ESC still undecieded). I have never run a Neu motor, only Feigao's and I will say even though I havn'e seen the motor run yet I am already impressed with the motor...I have always said you get what you pay for...but 1 thing does bother me, the shaft has a flat ground, but in the middle and not the end...I ll see when I mount the motor if this is a issue