Gaaa! Sorry. I did something similar to my valve cover once last year. Igot the helicoil unit and it worked perfectly. I did a write up. I hope it helps, even though it is a somewhat different job. I considered drilling the hole as perfectly straight as possible to e critical, since I needed it to seal. My write-up:
http://ecomodder.com/forum/showthrea...tml#post441039
BTW, offer an honest apology to the friend, ask how to make it up, and if she's a true friend, you've lost nothing and probably gained.