Hi I just purchased my first plane, a j3 cub bl. anyways, I had it out for the first flight and had it up for a while then needless to say I wrecked it. I was trying to change out the shaft when I reallized I was sold the wrong one. I only realized it was wrong when the front, outer part of the motor cracked trying to make it fit, I was wondering if I could buy just that outer peice or if I have to replace the entire motor? any help is greatly appreciated, thanks.