I just recieved my Feigao 8XL motor and was wondering if the shaft where the pinion goes on should have a flat spot or not? Mine doesn't have a flat spot on it and every electric motor I have ever owned had one to secure the pinion to the shaft. So, is this normal, and if it is, should I just put a flat spot on it my self or is it not needed?

Thanks for the help,

Darion