.....by the way DaveC, sorry if it's too late or you know this already but I didn't know when I started this job the clutch pin is secured by the worlds smallest grub screw....and it's thread locked.
You will never turn the pin out by itself, and I made a real mess of it trying before I realised.
5 mins with a heat gun/hair dryer and then the smallest Allen key you can find will sort it.
Even though I made a mess of my pin, once I got it out and swapped levers it all went back in ok.