Hi, my motor (edit: Flipsky 120kV) ran for two summers and then the bearings started keeping noise. After a week of not foiling the prop shaft was stuck, and could be forced to move again but some maintenance seemed to be in order. I have partly disassembled the motor, but am stuck with the backplate now. I got the rotor out and it has clearly taken some water in from the prop shaft, but just enough to kill the bearings.
Anyone know how I should pull the backplate apart without damaging it?
Is my prop shaft gasket the old and bad type? The bearing marking may not be obvious from the image, it’s NSK 6001V.
Backplate:
Prop shaft stack:

