Measuring ride height

Adjusting blade raises and lowers the ride height. That description is vague. The measurement is to the blade where it grabs the torsion bar. Directly below the torsion bar where you adjust the ride height.
Does some one have a close up photo of where to take the measurements for ride height on 70 Duster. Is it from the lower ball joint to floor and adjusting blade to floor. Then subtract the two. What are they meaning by adjusting blade
From what I recall, the measurement is to the round part of the lower control arm where the torsion bar enters the control arm. They actually have a tool for that measurement that hooked on the grease zerk of the ball joint and lined up with the area I described with a spring loaded scale.