on the dyson u need to take the base cover off the dyson to remove the belt there should be about 4 - 5 screws to remove the cover then your expose the brush and belt, if you lift out the brush which should be on runners you can remove the belt, to install the belt lift out one side of the brush, instal the new belt around the metal rod first then you need to pull the brush towards your with the belt on and pop it back in the brush runner.
Lee Newton, October 2007