I am fixin' to downsize my house and reduce the number of stereos I have up and running. I decided to sell a pair of L200's and I thought I would reform them since they are kind of due.

I removed all of the threaded screw and when I got to the last one, it decided to be a problem child.It unscrews about halfway out and then spins, either advancing or being able to be rescrewed back in. What appears to be happening is the threaded nut on the inside of the cabinet is spinning with the screw/bolt. I have sure I'm not the first person this has happened to. Any advice?

It's the bottom bolt in this photo
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Thank you