Post has developed play up-down play while in the UP position
Note: A small amount of play is required in the DOWN and MIDDLE (multi position posts) position. If some play has developed in the UP position, this can be corrected.
Lift up the bottom portion of the protective boot and tighten item (#52) ½ turn clockwise. REPEAT until you feel just a small amount of play up and down in the post. (push down on the saddle, and up pull up to feel for play) Caution: Overtightening the cap will eliminate the play but will cause other issues such as not locking in the up position or getting stuck in the up position. More detail can be found on this under the maintenance section (proper position of top cap #52)