" I have a ten year old ex-racehorse who is a speed
freak also. He to scares me, I refuse to go to anything other than an
eggbutt snaffle, but I will use a running martingale for leverage. I am
also looking for advice on this matter, so all you experience people, speak
up."
Take him on a really, really long ride and let him
get good and tired out. Then take him out the next day, and so
forth. He'll learn.