Assuming that you don’t want to mangle the lower fastener…
Get two nuts that thread on to the exposed threads, jam them together, and then use a wrench to hold the upper one while you use a hex wrench to remove the bolt on top.
The same concept is demonstrated in this video about removing an engine stud.
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Assuming that you don’t want to mangle the lower fastener…
Get two nuts that thread on to the exposed threads, jam them together, and then use a wrench to hold the upper one while you use a hex wrench to remove the bolt on top.
The same concept is demonstrated in this video about removing an engine stud.
https://youtu.be/2FdlswYqNWM?si=gMSpW9P0pp4L6hI6&t=28
If you don’t care about the lower fastener just grab it with some vise-grips or a vise.