Hate to say it but this is a horribly designed desk and the instructions are just as bad! First off, the desk only comes with one part D (as it should), yet the instructions state to use it in step 5 (not the correct part) as well as in step 15 (the correct place). The cams are way too loose and the screws that they lock into have to be threaded just right or they are too short to lock in. The screws should be able to be installed till they are hand-tight and be at the proper height for the cams. Lastly, when you are putting the desk section onto the bookshelf section, they are at different heights (difficult to tell in the pictures), but this causes undue strain on the components that are already weakened by the poor design previously mentioned. The overall design needs some improvement...then it might be a great desk.