Hi,
Just got my copy of this lovely book. The repair bits are very good. Even better is the section on Key Bass Players and Jet Harris is there with all the other world class bass players. There is also a foreward by Carol Kaye who must rank amongst the best.
The author is Paul Balmer and together with Haynes they should be congratulated on an useful technical manual and a brief but accurate history of the players who were so influential in making the Fender basses famous, including Jet.
Don't wait for Xmas, it comes packed in a small square box and S or HWMBO will be very pleased you have only bought a book and not another guitar.
Regards, Luigi