I have been using a battery powered impact wrench to change my blade and the rated torque is 130# which is close to the value that Toro recommends on their walkbehind mower. I was reading the manual on my new Scag Turf Tiger and they only recommend tightening to 75#. I am wondering why there is such a spread between the 2 manufacturers. What do most of you use to take off and tighten the bolts on your mowers and do you follow the torque value listed in the mower manual??