I put in the rivnuts in this entry (https://eaabuilderslog.org/?blprojentry&proj=7kreuJROA&e=7tHQzsUap) and had a problem with one of them. I spent a lot of time trying to figure out cutting, doublers, making it perfect, etc. Then I talked with some folks who reminded me that this was a coverplate, had no stress on it, and is not providing any support to the wing skin. So, I cut off the back of the rivnut, worked on drilling it some more, and got it out. Then, I used a big aluminum washer as a backer, filed the sharp/rough edges, and put the rivnut in with the washer. There is still some space between one edge of the rivnut and the skin, but the Al washer is firmly locked in place and holding the rivnut. I do need to remember that this rivnut is more likely to spin, even with the superglue, but aside from that it works great!