Installed mine today and it was a very straight forward install. I will say it’s very concerning tightening the wingnuts down. There were very audible cracking noises when doing this. I can’t tell if the noises were coming from the actual towers and bars or if it was from the car.
All I know is there is no way I have the guts to put 8nm of toruque on the wing nuts like the manual states. I have a torque wrench and I set it to 4nm to start with, stepped it up to around 5nm and wasn’t brave enough to go any further than that after getting one very loud audible crack. I inspected the glass and didn’t see any damage, but the sound was horrible. I backed all 4 nuts back to 4nm and left it there, it still feels very secure.
It’s hard to get a picture of the metal attachment points under the glass, but they area pretty wide and it would be hard to miss the areas with the bolts.
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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.