Definitely not cheap, but good quality.
And it's also the source of a lot of good information about guitar repair and guitar electronics.
In addition to Dan Erlewine's excellent videos they have a number of useful online education references. This one's called Understanding Guitar Wiring.
If you're new to this stuff, or not sure of the terms used, or could use a refresher, start by having a look at this Glossary. If you find that there are too many terms that you do not know it may be worthwhile checking out the rest of the program:
Understanding Guitar Wiring
"A little song. A little dance. A little seltzer down your pants." -Chuckles the Clown
GUITARS : https://legend.barryeames.com/guitars.html
MUSIC/PIX/VIDEOS: https://getback.barryeames.com (including Spectrum ST)