Step 6. Fix the front and back rails in place
Lay the two end assemblies on edge on a flat, even surface, opposing one another.
Apply glue to the notches and the ends of a front or back rail.
Position the rail into the notches so that the ends of the rail are in 20mm (3/4") from the outside edge of each notch. See pictures.
Fasten with three screws each end.
Note: Pre-drill the holes for the screws in the rails prior to fastening.
Flip the unit over and repeat the same action on the other side.