IKEA Hack

Step 8 Insert Cross Dowels

Insert cross dowels into the four holes drilled through the surface of the 2x4 sections. Depending on the tolerance involved, this may require driving the crossdowels into the holes with a hammer. To push it in beyond the surface of the board, place a screwdriver or chisel atop the crossdowel and slightly tap it with the hammer. Make certain that the slots on the crossdowels are all facing the same direction inside the board.