I had a similar problem with PC-7. I had to rebuild a couple of bosses, and when dry, I shaped them with a Dremmel. We are dealing with 50 year old plastic, and I was afraid I might have more studs pull out, so I installed those little spring clips over the studs and set their height such that they would contact the deck lid. Took a little trial and error to get the height right. Then I covered the clips with a small amount of PC-7 to protect the deck lid from getting scratched. So when I installed the spoiler, all the tension was held by the spring clips, not the spoiler, itself. Not the way the General did it, but he was using new spoilers, not 50 year old ones.
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