Build the Axles
of four-by-four timber, and by the aid of a drawing-knife or a good, strong, sharp jack-knife, trim off the ends of the timber to the form shown in the diagram.
When the ends are small enough to allow the wheels to revolve freely, saw out places in the side-boards of the car (Figs. 127 and 128), into which the square part of the axle will snugly fit.