If i remember you lift the leather up and past the knob, you will find a black push fitting with a crush clamp wrapped around the bottom, remove the clamp and pry one of the clips away and pull at the same time...........
I used a jubilee clamp to refit my R-line knob in my gti
Hope this helps
Wez
I used a jubilee clamp to refit my R-line knob in my gti

Hope this helps
Wez