Any tricks to removing an old tailgate?

[usnabill]

I acquired a donor tailgate to replace my current rusted through one. However, I am having some trouble getting the old one off. I used some rust penetrator to get the bolt to spin on one side but can't really figure out how the mechanism works. Any pictures or descriptions that I could use to get started? It's a 66 step side if that matters. Thanks!
-Bill
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