It looks like the fenders are run as high as they will go. Too high and a lump is formed under the leg. I just finished a job like this, only in leather. The top of the fender was shortened about 3 inches which enabled it to be moved closer to the tree. This then freed up the leather at the bottom, easily allowing the use of a hobble. When a hobble is done up tight it will help turn the stirrup. Hobbles are also for safety to prevent the stirrup from turning.