Actually I thought I remembered that from a book I have with the original patent design that leo submitted in 1977 but once again I was wrong. Upon reading it, it just says:
"In a bridge for stringed instruments of the type including a plurality of independantly movable drums which permit independant adjustment of the length and height of each string of the instrument, there is disclosed an improved construction wherein all of the drums are urged axially into contact with each other and a fixed point to reduce vibration of the drums and wherein the adjustment holes through the drums are arranged to prevent fraying of the sleeve of a player of the instrument as such sleeve is passed over the bridge."
Taken from "Fender the Sound Heard Round the World on page 269 in the chapter about the founding of Music Man.