If you flip the Dyson upside down you will see
First job is unscrew the 3 retainers (arrowed) they turn a quarter turn.
If your belt hasn't snapped it will need pulling off the motor shaft
The brushbar can now be pulled out (this brushroll had a groove scored
into the side of it caused by a hair grip its visible just to the left
of my thumb)
With the new belt positioned on the new brushroll insert it into the hole and locate brushroll
(To make the belt easier to locate on the motor shaft give it a bit of a stretch)
Ensure these lugs are located correctly
Pull the belt over the motor shaft
Refit the soleplate cover and tighten three screws
Before switching the machine back on rotate the brushroll to make sure the belt hasn't been trapped between the soleplate.
I hope this helps and good luck!
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