Ok?To get this gap set right you first need to unlock all anti-scalp wheels, turn the mower height adjustment knob to the "install" position, and then lower the deck to the ground. Then remove the hair pin clips and pins (D) and adjust both links (E) up equally. Now you need to raise the mower fully and check for the gap (A) between the height cam (C) and the rock shaft arm (B). Repeat this process until you get close to 1/8".
So what do the three bolts on the yellow zinc plated link between the 3PH rockshaft and the mid rockshaft do?
You should be able to remove, and throw away link E and have no effect on gap A...