Measuring 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
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.