That's better, now I understand what you are asking.
The holes are to set the governor sensitivity.
Closer to the shaft makes the governor respond faster and provide better load regulation.
Too close and you get hunting where the governor over compensates for load changes and over shoots then undershoots.
Sometimes this becomes a self sustaining oscillation.
Pick the hole that gives you the best performance of throttle.
In the 80s a rod for that engine was over 100 bucks.
I have no idea what the cost will be today.