Stacking Kit with Konstuktionsmangel

Kit stable but complicated assembly instructions (2x dryer on washer lift) and a tool for aligning the dryer when it is in the rail does not exist. The feet of the dryer is a hexagon (wrench, size 24) and as a key does not fit definitely into the narrow channel of the track. Did the rear feet on level ground (level) aligned and aligned the front after putting on the washing machine with the help of my son by 3 times extraction from the rail. The previous dryer AEG has so easily solved with round feet and side slits for a screwdriver.