Courtesy, in part, of Gene Freeze, President, County Saddlery, Inc.
So what happens when a tree is “adjusted” from the original design?
ROCKING AND PRESSURE
It is difficult if not impossible to simply squeeze or open tree points EVENLY using the devices typically used. It is no wonder, therefore, that trees that have been so altered rock on the horse’s back and create uneven pressure at the points.
DISTORTING THE SHAPE
Different tree sizes have different shapes. So it is impossible to make a pommel designed for a narrow horse spread to the shape of a wide horse by simply pressing it open or closing it .
What happens to the REST OF THE SADDLE when you stretch or close the front of a tree?
Consider how the saddle is constructed:
...The tree is made to very precise specifications in terms of shape and balance and calibration.
...It is reinforced with steel over the top and underside of the pommel as well as down its length to a precise tension.
...The tree is then strained up with nylon webbing from front to back and side to side to a precise tension and shape.
...The seating material is then placed on the webbing.
It all begins with a tree and any alteration or adjustment to the tree after the saddle is initially made affects every other aspect of the design:
...The tree shape is altered and no longer calibrated ...The tension in the steel reinforcement is altered ...The strain on the webbing becomes looser or tighter ...The seat itself is now sitting on a platform compromised by all of the above.