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Looks liek a bit of corrosion on the nut embedded in the plastic. I had a problem with a screw that was frozen to the nut to where the nut broke loose and would turn in teh plastic. I heated them up with a soldering iron on the nut until it was soft enough to pull out about 1/8 inch, enoucgh for an open end wrench to get a grip. Then was able to break it loose. After getting it loose and cleaning both the nut & bolt with a wire brush I put the bolt back in a couple threads, heated it again until I could push the nut back into the plastic and then heated the nut to melt the plastic back to where it got a grip.
Hope you don't hit this issue, but that worked for me
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