Right, i only took a few pics as i was getting increasingly frustrated with the wheel and then the new boss, so went to my local garage i use and the only option was to start cutting the plastics behind the wheel (still part of the wheel assembly) to gain access to the bolt and pull it back straight.
we then tried hammering a socket over but it was just bending the lug before it got enough purchase even with wedging tools behind it so we cut away a large section of the plastic and got out the angle grinder. This did work! Cut a slit in the head with the disc then got a big flathead screwdriver and released the bolt, i thought great thats it sorted but oh no, the momo boss had other ideas. The cutouts in the boss for the horn/steering wheel control connector and the little round bobble (not sure what it is, something to do with cancelling turn signals) were both in the wrong place and did not line up.
so the garage had to drill a new hole for the bobble and i unscrewed the plastic housing for all the controls so you were left with just the pin connections as above that did fit through the cutout in ghe boss. As we would just be using the horn we only needed to connect a new wire to the third pin and attach to new wheel horn.
We then realised we needed a new wire making up for the earth which we attached behind one of the 6 hex bolt screws holding the new wheel in place. I also attached the restrictor for the airbag connection that came with the boss. Now mine is a HR and online it says you need 2 airbag restrictor but so i bought an extra one as the boss only came with one but when we got the airbag off eventually it only had one connection so maybe different countries had 2 connections?
Anyway, got all that done, went for a quick spin and soon realised the mark on the centre spline which should indicate straight on and where to position your wheel was one spline to the right so my new wheel was pointing a few degrees right when going straight, no good when you have OCD so had to take ghe wheel off and re-attach one spline anti clockwise from the mark. All is now good (apart from one butchered oem steering wheel)
finished pic below (excluding horn sticker which i have now added) looks much better. The wheel is an OMP superleggero, 350mm dia as opposed to the 370mm stock wheel and hell of a lot lighter.
The moral of the story, take extra extra care with the security torx bolts and dont buy a momo boss or you will end up taking 4hrs to do a 30 minute job.