Not easy. You need to dismantle the whole of the brush assembly. Removing the outer clutch actuator from the clutch assembly was a particular joy (there are two catches on the outer cap which you have to prise down by inserting a couple of thin knives between the two components whilst pulling the cap off). the process is shown graphically on sparesavers.com. Use the following link :
http://www.sparesaver.com/help-and-support/dyson-section/dyson-technical-advice-450/dyson-dc07-technical-advice-459/dyson-dc07-changing-the-clutch-to-motor-belts.html
Alan S
Alan Sellars, April 2008
