Join Date: May 2004
Location: Southern California
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For my threadless HS, all I needed was a 5mm hex bit socket or Allen wrench. Once I removed the top cap, and loosened the two pinch bolts, everything slid apart. In my case, I have bearings in a retaining cages. I soaked the bearing in solvent to remove the old grease. I also cleaned the bearing surfaces. Then applied my favorite grease (Park Polylube is my fav) and reassembled.
When reassembling, operate the screw on the top cap before tightening the pinch bolts. The top cap "pre loads" the headset and essentially takes the play out of the system. Once you've taken out the play without causing any binding, tighten the two pinch bolts. That's about it.
I used Park's website to guide me, and found their instructions very good.