I have had my Exmark 52" 23hp for about 3 or so weeks now and am planning on changing the blades today or tomorrow. It says that I should torque the bolts to 115 ft-lbs. or 120 ft-lbs. I can't remember. I don't have a torque wrench. Do all of you torque them down to these exact numbers or do you just tighten them up to about what you think? Is it really that important?