Managed to chuck the cone, just, took a flyer on the job which went well. clutch now all back together and working well. I removed 2.5mm from the edge, removed and re-sized the liner and re-fitted it and re-assembled the whole thing. All working great now. A word of caution, chucking the cone on the bearing case really was a 50/50 job and I stood well back whilst maching it!