How to Remove Troy Bilt chainsaw clutch.?

I have a troy bilt TB4620CC chainsaw that I want to take the clutch off to fix the oiler. The clutch seems to be held down with a nut and there is nothing to hold on to for leverage to loosen the nut because the outer clutch wheel is always turning. Is there a special tool to remove that nut?

Thanks for your help in advance. Dominic. More.

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