JZNx,
I think you'll find that what you're trying to turn is compressed or welded to the bracket and is not designed to turn. The nut you should be trying to turn is the lock nut on the underside (in your photo) of the bracket next to the switch its self.
I could be wrong, because its been years since I've been under there, but you may need to use a very thin wrench on the lock nut.
Good Luck!
Gene
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