We use a compressed air impact wrench that quite readily removes the blade bolts.
The center blades wear out a lot faster than the side wing blades. These blades were replaced last year, but they show substantial thinning and distortion. Below are new and used blades for comparison.
In contrast, this is the second year for the side wing blades and they are not near as worn as the center wing blades.
Here is the new set of blades on the left wing with Jeffrey.