I have a new Lesco 52" Hydro Walk-behind. I have not changed the blades on it yet. Does anyone have a suggestion on the best method to change the 3 blades? I don't want to use a Cresent wrench. In the long-term, what's the best tool to use every time? 1/2" Pneumatic Impact Wrench? (Electric) 1/4" Pneumatic Impact Wrench? (Electric) Torque Wrench? Should I buy a the Robi Impact Wrench (Cordless from Home Depot) Can anyone send me a link to a picture of the tool they suggest?