William J. Moore, Balancing and Shoeing Trotting and Pacing Horses
“ In all my experience with knee and arm hitters I have found the offending foot too high on the outside, with the most of the foot from the center of the frog on the outside of the leg. With height and width of foot on the outside of the leg, it is just contrary to science. To straighten the line of action this needs to be reversed; edge up the outside edge of the foot from the outside toe to the point at quarters as much as it will stand, do it at every shoeing and you will be getting the leg closer to the middle of the foot. ”
