Bob, I'm modifying the tree myself,with the help of my tree Maker, mostly because I wanted to learn how to build trees, we tried several different trees that he has as regular production trees, but none of them fit well on the withers, so as a experiment I wanted to widen it so it set properly, to allow freedom of movement in the shoulder, otherwise it sat to far back and was restricting movement at the back of the shoulder blade, So I guess it would be the same as sending a model of the horses back to the tree Maker, I have the benefit of being close to a tree Maker who is willing to teach and I have the necessary skills to do the work. I thought the process might be of interest to somebody. Thanks, John