On unpacking, i found one of the L-shaped shoulders had come unglued; no problem, i re-glued it. The tricky problem is that on assembly, the bookcase put together, the central drawer runner is at a different height to the side runners, meaning the drawers will not fit. i have now to remove the back, remove the support, and make a new piece which will fit. Not acceptable; the time spent doing this I do not need. the support from the top is short by the thickness of the drawer runner; are they all faulty, or just mine?