Adjusting the hosel on an iron can be a pretty simple operation - as long as you know what the material you're working with will react like and you know the limitations of the metal movement.
The Perfect Bend focuses on the Thrust Factor for metal bending. The Thrust factor is the amount of force to be used for a particular material in addition to the type of force (jerk versus gradual).
Cause and effect of the iron's spec and performance are identified along with some great tips on making those severe bends upwards of 10 degrees in movement.