I recently bought an older American Jazz Bass at a good price. However, when I took it to a luthier, they found the neck needed extensive work—like a fret leveling, a new nut, and possibly even a truss rod replacement. The luthier suggested that getting a replacement neck would be much cheaper than fixing the original.
So, I followed their advice and replaced the neck myself. The installation was easy—just unscrew the old neck and attach the new one. The new nut already had grooves, but I had to file them larger to fit my 45-105 gauge strings.
I see no difference in workmanship between this made in Mexico neck and the original American one that came with the bass.