Clutch Basket Removal....Castle socket??

Got stuck removing my clutch. On prior bike I could hillbilly this nut off with a hammer and a chisel (gently). However on this bike whoever assembled it obviously thought they were He-man with a torque wrench as the thing won't shift with my bodger methods.

Here's the nut..... does anyone (nearer Tidworth the better) have the correct socket to remove it that I could borrow? (It'll be the same as used on a Honda Rebel/CB250/etc).

http://i1249.photobucket.com/albums/...ps6c46ad68.jpg

http://i1249.photobucket.com/albums/...ps6ed9ffde.jpg

too far away but, find an old socket usually a split one lying around somewhere, and cut slots out. the price of a socket is about the same as the correct tool.

Managed to destroy a Dremel trying to cut a socket. Admitted defeat and managed to find the correct socket for sale for cheap.