"Jury rigging"

I've just disallusioned myself of a folk etymology.

I had been told that "Jury rigging" was a corruption of "Gerry rigging" ("Gerry" from "German") describing how the Germans kept stuff up and running at the end of WWII. Per the OED, however, this is however, not the case. According to the OED online, it is an old nautical term, of unknown origin, but recorded with this meaning of improvisation back as far as the late 17th century:

1. Naut. A temporary mast put up in place of one that has been broken or carried away.

2. Hence jury- is used in comb. to designate other parts of a ship put together or contrived for temporary use, as jury-rig, jury-rigging (whence jury-rig v., jury-rigged ppl. a.), jury-rudder, jury-tiller; and humorously of other things as jury-buttocks; jury-leg, a wooden leg, or any contrivance to supply the place of a disabled leg (whence jury-legged a.); jury meal.

OED Online, SECOND EDITION 1989


They also suggest that "jury" might be a shortened form of "injury," however, there is no textual evidence to support this.