My first introduction to clocking a brass instrument mouthpiece began several decades ago when I was returning home from Willard Elementary School in Moline, Illinois. On the way home I stopped at a local gas station to visit with its owner.  That day I happened to be lugging my Olds Recording cornet home with me and as I visited with the proprietor, we were joined by a customer who aggressively questioned, “Hey kid, what are you doing with that horn”. As a grade school youth, I was more than intimidate as I replied, “I’m taking it home to practice” was…