Most books dealing with "four-finger" playing are really SCALE METHODS and don't really teach you anything, they just say "Here are my fingerings. *PLAY* my fingerings!"
I recently went through Tom Gale's "Technical Foundation..." volumes 1 and 2, and I-Kid-You-Not, they do a Good Job.
The books are actually Pedagogically Useful - as in, you could teach from them and your students wouldn't be confused as soon as the door closed, and you personally could pick them up and read them and actually be guided through a well-thought-out way to figure out "four-finger" technique (instead of just blasting through scales and turning up the metronome, hoping to "get better at it").
All the other "extended technique" books I've seen, while doubtless Well Meaning, are really just scale methods, and go from bottom to top, begging you to Hurt Yourself, but Gale's books are actually teaching tools. Volume One takes time to explain what to do and why, what the physical motions could/should be, how to start in small doses - and then he takes his own advice and starts in the middle of the bass, in small doses!
Hey! I forgot to say "Thank you" Its nice when someone out there gets it and comments also! Thanks KPO!
Tom Gale
ASODB.com