When I do work on the pulleys I always have them both on and connected (belt/chain) and use a tool to lock them from moving then use the impact if appropriate (avoid using impact gun on engine pulley as you can cause damage to the magnents in the stator so I have been told.)Tried that just now Still no luck figured my 1/2 m18 Milwaukee battery impact would get it might just have to get a better impact on it .
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