The main job of a headset is to allow you to turn. The threadless headset, you have to loosen the stem bolts and take off the compression bolt, then you remove the spacers, after that you take the retainer bearings out. By that time the folk with drop out or fall out. After you take everything out, wipe the old grease away and put new grease in. Put your steer tube back in and then put it back together the same you take it off. After you put the folks through the steer tube, put your spacers on and then put the handle bars on. Tighten the stem bolts at the same time so there is a equal amount of tightness. Do not tighten the compression cap on to tight so it's not hard to turn or so you don't wreck the bearings.