The basic idea of the tenon and wedge construction is simple: the peg passes through the shelf passes through the side of the bookshelf. The execution requires a lot of patience and a lot of sanding. You should cut the holes a little smaller than they need to be and sand/file them to get a tight fit. The pegs are almost door-stop shaped. (Longer pegs are better.) You will need to use a jigsaw to cut the holes, of course, and that will require care.



I have sent a few people this file with some more dimensions. I can't guarantee it will be at this location forever, but for now: differentlightsolutions.com/randomtxt/printable_desk_dimensions.pdf .

The first few pages use "idealized dimensions" so they won't fit real lumber. The last page uses the actual dimensions (like I said, plus or minus a hair) used for the ends of the shelf. I made a prototype end piece with those dimensions to make sure they would be sufficient.



