Cantles
Cantles are the most complicated part of a tree to get right, and for saddle makers to understand, which is why we have a few blog posts just on them.
https://www.rodnikkel.com/content/understanding-tree-measurements/cantle-conundrums/
https://www.rodnikkel.com/content/saddle-tree-blog-from-shop-and-desk/speaking-of-cantle-angles/
https://www.rodnikkel.com/content/saddle-tree-blog-from-shop-and-desk/of-cantle-width-and-dish/
https://www.rodnikkel.com/content/saddle-tree-blog-from-shop-and-desk/of-cantles-and-angles-again/
https://www.rodnikkel.com/content/saddle-tree-blog-from-shop-and-desk/cantles-cantles-everywhere/