Removing the stator assembly is a bit hard, as you have pull thru the magnetic force.
Use some WD-40 on the 17mm bolt, after which it can be removed easily.
Putting back new stator is also, only thing you have to remember is correctly torque it, 17mm bolt,
use a screw driver (passing the rotor cap) which stops drum from rotating and you can correctly
torque it, be careful NOT to over do it, otherwise you'll damage the threads.