RB Engine Valvetrain ???????????????

Your rocker arms have 2 oil gallies right? 1 pointing to the front ( Valve side) & one in the back that oils through the adj (pushrod side)
If you change the adj screw to a ball style it need to have a simular type of oil galley/recess cut into the threads or it will burn up the pushrod/adj. no galley= no oil= no more pushrod/adj
If the balll type adj doesnt have a oil galley/recess in the theads you need to drill your own oil galley in the rocker to supply oil to the pushrod/adj