I’m trying to remove my 1999 factory roof rack. I’ve got leaking in my A-Pillar and the headliner around the visor. I’ve checked all the sunroof drains and they appear to be clear (hard to tell with the rear ones as the weed eater line wont’ go all the way up but I blew compressed air through and it seems to flow). I think this might be the first time the rack has been got at. All the Torx screws came out fine (they were in their good and tight with silicon) except one. For some bizarre reason the “slot” (where the screw driver bit goes in) is filled with some kind of impervious metal. Like it was melted by Vulcan himself and poured in. We’ve tried metal drill bits, chisels and punches and nothing even scratches it. Is this by any chance something the factory might have done? Any idea how I can get that Torx screw out? Also there were four square holes, one at each end of the rails, with plastic tabs in them but no screw from the rack rail. I filled these with silicon. Any idea what they’re for? Thanks.