Originally Posted by
Leebo
The spacers need to sit 2-4 mm or so above the top of the steerer tube so the cap can be tighten up, and then the pinch bolts on the stem tightened.
+1 If you don't have a gap between the top of the stem or top spacer and the top of the steerer, you can tighten the bolt all you want but the steerer can't move upward to remove the play.