Had my first oops today on a rib in the horizontal stabilizer (the hole should be round, not oval). It was the first time I had used my angle drill and I hadn't practiced with it which was a mistake. One piece of advice I got at the beginning of my flying was that "if there's any doubt, there's NO doubt!" In other words, if you're not sure, err on the side of caution. I probably could have made an acceptable repair but I had doubts so there was no doubt that I was ordering replacement parts. Luckily, Van's sells replacement parts at cost if you've already purchased a kit so it's not a big deal. Try that at the local car dealer.