the adjusters do have a band in them for oil pressure to get to the cup, i pulled one out last night when i was taking pics.
see my pic above ^^ with the light, i couldn't tell just by looking because the hole is drilled at an angle. i saw the hole in the bore for the adjuster, and i saw the hole in the bushing for oil from the shaft to flow...but the holes weren't in the exact same spot (because it's drilled at angle). so i put a light in the rocker body to see if the hole in the adjuster bore lit up...it's drilled through.