If the crank is rotating when you are trying to remove the big nut to remove the blade remove the spark plug and put rope into the cylinder until the crank will not rotate.
A metal tool is sold to replace the spark plug to stop the piston.Why not just spend the $10 on the blade removal tool.
Or use a chunk of 2x4 to hold the blade.
Just thinking the string in the cylinder to jam the piston can not be good for the engine.
(( cowboy up and get over it ))
A metal tool is sold to replace the spark plug to stop the piston.
The metal tool is recommends by the manufacture.Why would you risk doing damage to the piston?
It's never good to use the piston to stop a engine from turning.
I know guys on here put a string in the cylinder and that's not good but to put metal tool in to stop the piston could put a hole in it
(( cowboy up and get over it ))
I still say it is better for the engine just to hold the blade from moving when removing the blade nut or bolt.
Less wear on the internal engine parts and a whole lot faster and easier than pulling the plug and inserting a foreign object
(( cowboy up and get over it ))