A4 b6 headlamp switch refurb - help ??

[tigerminx1]

Hi all, decided to refurbish my typically scratched and worn headlamp switch shroud.
I've bought the bits, removed the switch from dash, removed the 'collar' - but not can't figure out how to remove the actual centre knob ? - Don't want to end up smashing the unit - so I'm here for help !
Do I have to split the switch unit itself to release lugs on the rear of the centre knob
I've included a pic.
Cheers for any advice.29122

[tigerminx1]

Found the info I needed on someone else's post........prised the outer 'plastic cowling off via the 4 prise holes, turned over and turned out switch. Prised off dial knob with a small screwdiver, replaced items, rebuilt and refitted. Works a treat :)