When you setup the pre load, I have to see the lifter plunger in the top of the lifter. I make sure it is at the top and take out any play while spinning the push rod. Once I am sure there is no lash and the plunger is still at the top of the lifter against the retaining clip, then I set the pre load. Some rockers have different threads and adjusters so you can't say 1/4 or 1/2 turn is correct across all motors.

I will see how many turns it takes to gently bottom the plunger and then set my pre load accordingly. I like the plunger in the middle to the top 1/3 of the lifter, has always worked me for many hydraulic cam installs. Years ago I installed hi po cams in many local cars for friends and even as side jobs for extra work.

Then I eventually raced a top alcohol dragster where I set the valve lash before every run. I took out the push rods every night to preserve the hi dollar valve springs...hundreds of times.
There's my push rod holder for a brad hemi.