Our courts aren't safe even in manga. I think you meant "Jerry-rigged" - I got a nice laugh out of this.
Thank you for the chapter!
Jury Rigged is actually the original term, it was in reference to Sailing, centuries ago, and replacing the Main mast that had broken with a "Jury Mast" that was kept on hand to put it together, and then "rigging" it, again a sailing term, to replace it.
There are TONS of various apocryphal stories and versions of how it evolved into Jerry-Rigged, what Jerry means vs. Jury, if it's just linguistic drift or something else.
For a time, Jerry-Built was actually the most commonly used terms in non-nautical circles.
And that's not even getting into the whole Jerry-Can nonsense, and if Jerry is actually a slur for German (who were the first to introduce Jerry-Cans), or if the term was used because it was a Can, that was used in almost an identical way that a Jury-mast was in sailing, to replace a motivational source for a vehicle that had broken down. And then Jerry became a term for Germans actually from that term as the origin, not the other way around.
Linguistic Anthropology/Entomology is a fun ride, and just like trying to trace origins of certain art styles or foods, often really hard to track down the real origins and reasons things changed, because so many local regions have their own myths they created around it.
But yes, at least in a good chunk of the English-Speaking world, Jerry-Rigged is most common, as it's like a blend of the original term (Jury-Rigged), and the one that evolved from it (Jerry-Built) in regions with different accents and not as much sailing culture.
If this is interesting to you, I recommend you dig into the history of one of my favorite of these types of weird linguistic stories, which is how the word Baphomet came to be and came to mean what it does today.