I just ordered a set of moog Tie rod ends for my 2006 E. I noticed there is grease in the bottom metal piece, but the rubber part up top is empty? I can just squeeze it down and there is nothing but air in there. Should I fill these with grease? I remember someone saying that these tie rod ends were pretty decent and you can "repack" then with grease. Are they talking about the bottom piece with the tiny hole or the entire tie rod end/bushing?