My main jets have a through hole all the way through the body of the jet, head to tip. My slow jets (SJ) have a hole in the lower body where the atomization holes are, and a hole in the top where the screw slot is, but these holes don't seem to connect in the center. Is this supposed to be a through hole, like the MJ? If so, i'll push a little harder with my tiny pin, if not, my cleaning is done.