Hi @vdgdqaws9bmdisg
Here's a [https://www.youtube.com/watch?v=eeaLgwhtAWQ|video] that may help.
If there's a faulty part and it needs replacing, here's the [https://www.ereplacementparts.com/dyson-dc07-upright-vacuum-parts-c-179635_179636_508029.html|parts list] that is useful.
Locate the wanted part in the list and then search online for the ''part number'' of the part, to hopefully find suppliers.