Im trying to take apart a metal desk, but Im stuck on one part. Theres one spot where the screw is visible, but the nut isn't accessible, so when I turn it, it just turns both. Ive tried moving other parts, but no matter what I can't get to it. Is there anything I can do to get it out? Im ok with going hard on it, but I'd rather not ruin the desk, so powertools are mostly out of the question.
Without any sort of picture, one technique that has worked for me is to pull on the screw to pull it out and then rotate gently - friction between the nut and its surface then allows the screw to come undone.
Tricky part is getting the “best” amount of pull compared to rotate. If it was cross-threaded then you are out of luck, see the next bit...
If all else fails, you will probably end up drilling the head off the screw - good luck.