There's a GREAT book out and available from Referee Magazine/NASO.
http://www.referee.com/books/books/bbbog3.htm
It also is available from "Between The Lines" Official'a Gear.
http://www.btlofficialsgear.com/Onli...category=20016
I have this manual and it has been the "Reference of Choice" in several "3-Person Mechanics" Clinics I have attended.
Good luck....enjoy your seasons!