I am thinking about purchasing an electric impact wrench to assist in the removal of mower blades. I don't have the room for a large air compressor and would like something more portable. Do these electric units (Dewalt, Makita, Sears, Etc.) produce enough torque to remove tightly fitted mower blades? I was looking at both cordless/corded options? Also do these impact wrenches cause any damage to the spindles or other parts? Any suggestions (brand, model, torque requirement) would be helpful. Thanks.