Wow. Definite fail from bike bandit!
Those end holes, unless I'm super confused, carry oil to the valvegear. The lower one (case/barrels) should be the "oil control orifice valve", something like a pilot jet that restricts oil flow to allow enough oil past for valvegear lubrication and restricting it enough to keep main gallery pressure up. The upper one is a tubular plain dowel with an O-ring at the joint.
Using solid ejector pins as shown will have you stopped with a trashed head, cam, and maybe rockers and their shafts - within a few miles of home.
