In that picture of the stick facing down, the screws for the face plate are visible. there are 6, if I recall, around that casing. Unscrew them from the back, and take the plate off of the front. Your mounting plate is probably not attached/broken, which would make it sink in like that. The mounting plate makes sure to hold your stick at the correct height, and is bolted to the face plate from the underside. If it's not attached, your balltop is the only thing holding your stick from falling into the case. Open it up. Take more pics if you're confused. :]