I bought a set of cross bars to install on my roof rack on my 15 slt and when I go to screw them into the side rails, the threaded part is all but rusted out. Anybody experience this before? Any recommendations? I tried searching (of course) but found nothing specific to this. Not really open to the idea of dropping $300+ on a new set of rails. I though of just removing rails, clearing out the inserts and backing them with nuts if there isnt a viable option for insert replacement.