Multiple Displays

I bought my second 23" Apple Cinema Display yesterday and hooked it up last night. I really like the added desk space that a second display offers. However, I have one question. Does anyone know if I can adjust the displays height on the stands? One display sits slightly higher than the other one. I realize I can put something under the lower one to raise it up, but would rather make adjustments to the stand if possible. If not, has anyone ever connected multiple displays to another stand (saw an ad for a stand that held two displays).