I have I castle 6900kv 2.5t motor, it has been playing up a little lately. The whole shaft moves around moves around like something has coming out somewhere in the motor, so I pulled it apart to find the bearing right at the back of the can out and on the shaft. But I put it back in, it's really hard to get in, but I'm thinking should there be a small spacer just before the bearing to hold it

Can anyone help me with this... I rather save the motor than have to but a new one.

I have grinded a spur literally smooth coz of this

Figured I would get a better response here rather than Australian Racing my country don't help much