Cracked it! On the top side of your cleaner, there are two screws that need to be taken off to allow access to the brush... Remove them and lift the top cover. Take out the brush from the right hand side as you face it and slip the new belt over the motor and then onto the brush. Slide the brush back in ensuring the "Square peg" on the left near the edge brush fits back in its hole and thats it! Stretch the brush into place and replace the cover...
Phew! Took me over an hour to figure it out! LMAO!
Warren Marris, March 2010