Hi footpump the motor is very easily opened up just a few screws. I have had mine dismantled because a screw came adrift, guess you are miles away from me Nr. Wigan if you need hands on help, but obtaining and replacing the bearings is quite easy. Hope all goes well for you
I had to extend the wire by 30 cm approx then soldered the wires onto the controller quite easy to do, if you mount the battery to the frame you will need to use longer 5 mm screws the ones holding the water bottle are not quite long enough.