Hi all. I've been riding for years, but here's a "noobie" style question: just bought new Look Keo pedals which install with an 8mm hex -- instructions recommend 40nm of torque. I have never installed my own pedals and do not own a torque wrench, an am worried about stripping out the crank threads. So here's the question: should I just go ahead and put these on myself without a torque wrench, and if so, how far should I torque them -- in other words, how critical is it, and how easily will I strip out the crank threads (Ultegra 9-sp cranks)? Thanks in advance for your advice.