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Sprocket removal for chainsaws OLEO MAC (year 1988)?

The teeth of the sprocket are worn out and I have to change it. But I have a hard time removing this sprocket : The 10 mm head nut is hard to unscrew, and I worry to break the shaft.
Do I have to force or is there any tip to solve my problem?
Thanks a lot for your help
bernard, November 2005
It's may be a left hand thread.

Rick, November 2005
link Click here to see other fixes for OLEO MAC.