Congratulations! Sounds like you have done a good job!
Regarding getting that pin out, I'd continue to soak it and forget the brutal stuff now that you have the toggles moving. You can get a lot done with it as is and there is no sense risking damage.
If you search YouTube you will find lots of videos regarding Luger disassembly.
Some old gun oils would dry hard like that, it has been said that old WE-40 would do that.
Please continue to exercise patience.
dju
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