After sometime you will have waterfalls inside the car with the kind of screw. Hehe. I actually watch cuz i need to repair our roof rail. Stock fastener in ours was bolts and nuts. I watched to check the type of sealant. Wether rubber seals or elastomeric seal.
May i ask if its better to get roof rail fitted as it might need to drill roof as well or simply we can get roof bars to clamped between the doors? Which option is better and reliable please? Thanks