So the replacement part showed up in the mail today. The first thing I did was print the part so I could make a replacement if necessary.
So if you are someone searching for a Walther P38 Retaining Latch Plunger, there is the schematic diagram and measurements in English units. Here’s a picture of the the little pain itself.
And as an FYI, that replacement part cost me 10 bucks. I’ve got it back in the frame and once I stop feeling like I’m going to hack out a lung I’ll finish cleaning the slide. I will say I much prefer my 1911, M1, and AR15 which I can clean with at most a simple set of punches and the standard rods and brushes.