How to remove when it keeps moving?

If you have a large pipe wrench, use that to hold the adapter. No pipe wrench remove the spark plug, set the piston at BDC, stuff cotton rope into the cylinder and turn the adapter until it stops. Make sure you leave some rope outside the engine so you have something to grab when you complete the job.
 
It just keeps turning. An impact wrench would only make it spin
Actually it doesn’t work that way. You can’t take a mower blade off without holding or wedging the blade to keep from spinning but with an impact, one doesn’t have to even hold the blade, for example
 
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