Originally Posted by Cab_Burge
You can buy allen head brass set screws...and then drill and tap the oil feed passage to the rocker shafts in the block or heads and then install the brass set screws and drill them to the size you want to use with a pin vise using small bits wrench up scope

The drill and tap in the heads is the approach I've taken with my W2 Econo's setup and Harland Sharp roller needle rocker arms.

HS specifically advised to limit the oil flow to the rockers, but not knowing what the right fit is for a street ride I figured I would play it safe by prepping for adjustability: if too much oil flows, I'll scale back in the size of the orifice, and all it takes is pulling the rocker arm shafts off and replacing the plug, as opposed to having to yank the heads off the block!