Harvey Riley, The Mule: A Treatise on the Breeding…
“ If the animal does not work easy in it, if it pinch him somewhere, let it remain in water over night, put it on the animal wet the next morning, and in a few minutes it will take the exact formation of the animal's neck. See that it is properly fitted above and below to the hames, then the impression which the collar takes in a natural form will be superior to the best mechanical skill of the best harness-maker. ”
