Originally Posted by luke352
I drilled my front plate and also enlarged the shaft hole since I fitted a collar to the front of my motor .....
That's great Luke. But I do not advise anybody follow your lead.
KE spins, tumbles and other such high energy maneuvers put a hell of load on the motor mount/motor box assembly, not to mention an unbalanced prop.
Weakening the motor plate by enlarging the center hole or drilling it would be at your own risk, and an unnecessary one IMHO. But each to their own