I'm trying to remove the tailgate mounting plate in order to replace the release lever bolt. Problem is, the 4 screws (now three) that hold the plate in place are so buggered and crusty that I can't even get them with a healthy dose of PB Blaster and an impact driver. I'm curious about attempting to drill them out. Has anyone done that before because I haven't. If these screws drill into a threaded hole that's part of the tailgate I'm worried about messing up the threads.
Any suggestions on how to get these out will be very much appreciated!!!
![Image](http://i949.photobucket.com/albums/ad334/rleberecht/Mobile%20Uploads/photo_zps554702ed.jpg)