I've replaced several tail rotors on mine, and what works for me is I use a channel lock pliers with the jaws spread fairly wide. I place one jaw on the backside of the motor (be careful of the capacitor solder joints) and the other on the tip of the rotor blade. I then very gently squeeze the pliers while guiding the rotor onto the shaft. Takes about ten seconds to replace now. Also, there is a right and wrong orientation of the rotor. If I remember correctly, the beveled edge goes against the motor shaft. Unfortunately I think my Axe has made it's last flight. I'll be posting for a solution in a separate post.