There are lots of screws/bolts that may be undone, but some may cause more parts to separate than I need - & then be hard to get back! There are 2 at the base of the motor housing, on the shaft. There are 4 more around the base of the motor housing ( accessed from below) & there are others - including some that hold the darker plastic end in place.
Which should, & which should not, be removed??

Graham, February 2010