The adjusting tool can either be a brass 3mm hex key, a white plasitc M8 hex key or the multi-size Marzocchi tool YR5162,
|top, 3mm, middle 8mm, bottom Marzoochi tool|
To adjust the internal rebound damping you will firstly need to expel the air from both legs and remove both top caps using a 21mm socket.
Using the adjustable tool, place tool into the centre of the stanchion and locate in the adjuster valve at the bottom (this is quite tricky, once located you will be able to push the tool right in to the fork).
To increase the damping (slower) rotate tool anti-clockwise, to decrease damping (faster) rotate tool clockwise.
|this is a rod removed from the fork so you can better see the valve|