I've never adjusted one, I'm trying to, the guy I bought the bike from used the wrong allen wrench trying to over tighten the bolt in the center of the stem. I just bought a new bolt, and I'm going to be doing the adjustment tomarrow. I have been told that unlike the "old" stems, the bole in the center is notused for tighening. Loosen the side crimp bolts, push down on the stem till it's tight, then tighten the crimp bolt things, then snug the center stem allen bolt thing. How close am I and haow much aggrivation does this sometimes turn into. I'm also going to take a closer look at the bearings just to be sure they are not the culprit. Even though th rest of the bike is sealed the headset is not. I'm starting to apprecieat my threaded headset, so much easier to deal with.