I had to laugh when I received this. It was all by itself in the box with a couple of packing plastic bubbles that only took up 1/3 of the box. The strange thing was the rattling inside as I was carrying it in! See the picture with the box cover under the bottom of of the box? That is how it arrived! No one bothered to put the cover on the box. The tool and 9 of the twelve bits were just  rolling around in the box under the flaps, wherever. The tool box was undamaged (fortunately so were the tool and bits).
  So I could not turn the adjusting screws for either the top or the bottom until I sprayed on some WD40. Then everything worked fine. With enough fussing to get the top pins at the right width and the bottom snug, I got the watch open, replaced the battery, and closed the watch. So it worked well for me.