340 adjustable LOCKING rocker arm kit

Technically you do not need those adjusters with the Locking nuts. A very simple solution is to tap the access hole on this side of the rocker arm that the factory used to drill the oil Passage. You tap that and then you go to the hardware store and you get some small I believe their number eight set screws. You then adjust your valves using the current adjusters that you have and once you have them set you tighten down the lock screw against the adjuster. You have just locked the adjusting screw from backing off.
Are you talking about the hole I have a white arrow pointing at?

Rocker set screw hole.jpg