When a Dyson clutch is faulty, I prefer to change the unit. Its more time efficient. I also prefer to buy a new clutch over a used one.
However, if a clutch looks otherwise OK, and the white nylon wheel isn’t all chewed up, and only the belt has snapped, I sometimes change the belts.
Some of the more adventurous amongst you will contemplate stripping your clutch down and repairing it. This isn’t a job for the faint hearted; or the amateur.
However, if you are determined to strip your clutch down, there are two videos that show you exactly how.
It does take a while, so they are split into two parts. The first part, disassembling the clutch is here:
The second part, rebuilding the clutch is here:
It must be noted however, that apart from the two drive belts (which you can get from >>here<<), no other parts are generally available for clutches. Dyson designed them to be a unit that you swap over if it wears out or becomes faulty.