The wheel axles will, of course, need to be supported on their outer ends as well as at the points where they enter the sides of the cart. To allow for this, cut two 3" X 5" pieces of 114" plywood, and form an axle slot in each of them. When positioning these plates, turn the cart upside down and drop a yardstick into the grooves cut in the plywood carriage sides. The slots in the in-place axle plates must fit the yardstick exactly. Mark the correct positions on the outer 1 X 2 frame pieces .. . then remove those frame members, glue and screw the axle holders down, and reinstall the assemblies.