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tom-g
M_V
Not meaning to sound rude but you are trying to undo it the correct way right??
I have only ever come across one that was really tight and wouldn't undo normally. If you loosen the locking so that there is a 1mm gap between the sprocket and locking. Then wrap up the chain whip to that it sits at 9o clock then give a tap with a dead blow hammer or a hide hammer. It's the shock that will loosen off the sprocket. Sometimes shere force will not do the job.
Failing the above, Coke (the drink) works as a penattrive lubricant. Pour a bit on the mating surface and leave for half hour to an hour. In that time it should work its way in enough to make it easier.
Hope this helps.