I have a 2 month old Surly Cross Check with threadless headset. A couple of nights ago I took the stem off so I could move some spacers around to drop the bars. Ever since then, I have been feeling a little wobble/play in the headset when riding. I read this:

http://sheldonbrown.com/headsets.html


So I tested by holding down the front brake and pushed back and forth and I feel some play in there. I took everything off again and put it back and made sure I tightened down the cap bolt and the bolts on the stem as tight as I could but I still feel the wobble. What am I doing wrong?