Here is an interpretation of the manual description:
Leaving everything connected, including the spring, loosen the lock nut on the pushrod fork. Now turn the pushrod to lengthen it until you sense that it has fully compressed the slave piston into the cylinder. You should be able to do this by hand, so you can feel the increase in resistence as the piston bottoms, but before the clutch release fingers start to move.
Now, using a .079 feeler gage, place the gage on the end of the fork and screw the locknut back down to meet the feeler gage. At this point you will have the feeler gage "pinched" between the nut and the fork. Remove the feeler gage, and spin the pushrod (with the nut) until the nut touches the fork. Now tighten the nut with a wrench to lock it.
This procedure allows you to get the .079" of play without having to fight the springs while you are doing it.