I received and installed yesterday. I don't have a torque wrench. I hand tightened the nut and then used the allen wrench to tighten just one extra turn. I also heard some creaking and stopped right there. I'm sure it's nowhere close to 8 nm of torque. But the bars are completely solid. The lock locks up the nut from turning, so there is no way it's going to loosen. I also checked the glass. The metal clip does not come into contact with the glass. My guess is the metal tab that the clip slides under was making the creaking sounds.