Yes, make sure the stem is loose and the expander plug tight before adjusting the top cap bolt to preload the headest.
If the stem is tightened you can't push it down, and if the expander plug is loose you'll draw it up instead of bringing the top cap and stack down.
Also, should have said this first, make sure the split centering cone is in place, and the spacers are pressing on it and not on the top bearing of the headset.
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Last edited by FBinNY; 03-27-11 at 08:49 PM.