Well, that was pretty hard work (on the floor) with an unexpected result...
I had to loosen and move the down pipe, but managed without removing the gearbox mount. My car has 12mm? spline bolts holding the gearbox mount to the subframe and I don't have a 12mm spline bit. However, with the mount unbolted from the gearbox it had enough movement in the rubber to hold it out of the way enough the extract the switch.
When I opened the switch it looks nothing like any of the examples I've seen.
Inside of my switch looks like this:-
The plastic centre is a cam with various lobes that open and close contacts which look like points in an old school distributor.
I'll try to clean them a bit and apply some contact cleaner/lubricant I have and hopefully it'll stop playing up...
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2001 D2 FL S8 Silver / Dark Myrtle, RS4 & 20" FE wheels, S4 steering wheel with paddles, Bose with Android head unit & reverse camera, Rear blind, heated seats (all), ski hatch.
1985 Ur quattro Tornado red, black leather.
www.urquattro.info