Mountfield BBC Clutch Removal

I've damaged the Blade Clutch on my Mountfoeld M3, MPR 10009 (200
model).
I'm a fairly good amateur mechanic, but I CANNOT get the B****** thin off!
Does anybody know the trick please??
The part in question is no 136 on the diagram on this URL.
http://tinyurl.com/pyg6f
Many thanks,
Mik
-- MGH
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