I am just learning something I did not know. I just went thru alot to put a solid lifter cam back in my SB. Using these rockers. I just want to understand what is in my engine to the best I can.
If yours is a street motor I would tap the hole on the pushrod side and put #8 set screws in them to lock the Adjuster and at the same time plug the hole. I would leave the oiling hole in the top of the arm alone.
I have evolved in my plugging the pushrod hole to going to use the set screw to lock the adjusters that are not equipped with a jam nut.