excellent !! you have convinced me to make my own shafts. and this whole discussion takes care of the internal thru shaft of the motor. But I have one other concern. Some motors use them dam aluminum prop adapters that screw onto the opposite side of the motor, and those suckers easily bend. rendering them useless. Thats fine if its easy to buy a new adapter, but like the internal shafts these aren't always easy to find. I'm sure you know what I'm talking about. So do you have a motor preference for your different size motors you use? I've recently discovered a website called Value Hobby . They seem to have a good selection and seem to carry spare parts as well.
http://www.valuehobby.com/catalogsea...q=gforce+motor
have you ever used GForce motors ?