How do you lubricate 1518 1Y rear bearing?

Hi there,
just wondering if anyone knows of an easy way to lubricate the rear bearing of the 1518 1Y 1800Kv castle-neu motor?

I tried to remove the motors back plate (held on by 3 screws) however it didnt budge and since I don't have a motor breakdown diagram I'm not sure if the back plate removes easily or not.

my intentions are to periodically lubricate the rear bearing (as well as the front one) whilst the motor is still installed on my jammin CRT X1. I really don't want to have to pull the motor apart (remove front plate and pull out the rotor) just to lubricate the rear bearing.