"Although both blades are adjustable, unlike a common sway bar only one blade need be moved for a fine adjustment.
I expect the setting on the non cable controlled blade would determine the effectiveness of the cable controlled blade.
"
Mike,
I agree. It appears the non-adjustable end is preset during practice, then the adjustable blade fine tunes the setting. The combination of both blade arms (and sway bar dia.) determine the overall roll stiffness.
Here's a view of the front end of Gentilozzi's TransAm Jag - single cable.
Sherwood