Im sorry about the shock tower you friend has. His only maybe other alternative may be to shove some broken toothpicks and try a larger screw. Then try forcing it in the hole and hope the toothpicks will give the screw more bite.
I KNOW EBAY IS THE GREATEST SOURCE FOR RALLY WEAPONS! LIKE THE ABSOLUTE BEST! hehehe, you can get a BRAND NEW RALLY WEAPON for less than a 100 bucks, and that's not even hard to do. Most of the auction always end under 100 anyways!
But, i think I'll stick to my C4. Maybe if I get bored of my BL system in my touring car, I'll buy a Rally Weapon and experiment.