The solvent did the trick. It was very gritty before. The pin would push the slide a couple of times, but it felt gritty. Then it would just seize up and not push/slide at all. Working fine now after cleaning and oiling.
Looking at what appears to be the tiny set screw for the cocking slide, I don't have a tool that would fit it to loosen it anyway. Only slotted halfway across. Almost looks like it's been welded on.
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