I think it's plugged to stop the oil from leaking out. This tractor didn't have power steering from the factory, I'm installing it to factory specs. I think the factory put's the plug on the manual steering models that don't need to use that hole to stop the oil from comming out hole (a plug). Just dont know how to take out that plug. Do I need to use a bore bit or can I drive it through and take the ball out from the oil plug that is right under this hole?Is it possible the "ball bearing" is to stop flow in one direction?