I recently purchased a cane creek s2 headset for my giant atx870 frame. I'm having a little trouble installing the cups, or maybe just shoving the cup all the way into the frame. So my question is, are the cups suppose to slide in freely or do I have to use some sort of lubricant to fit it into the frame, or do I just try to hammer it in. My next question is, if it does not go all the way in, can i ride the bike like that or is it unsafe to do so. All suggestion wanted, and thanks for the help.