One foot back from the front end arrange an axle-bar three feet long and two by three inches thick. Make another bar the same size for the rear axle but do not bolt it fast. This must be arranged on a king-bolt so that it can be turned by a post and tiller. The king-bolt and post should be in one piece, and this will have to be made by a blacksmith. Two round iron plates of metal one-eighth of an inch thick and five inches in diameter are provided with screw-holes at the outer edge and with round holes at the middle. One of these plates is to be attached to the middle of the axle, as shown at Fig. 9 A, and the other to the under side of the plank in the middle and about ten inches in from the end. A hole is to be bored and cut three-quarters of an inch square in the axle-tree, and the holes in both iron plates are also three-quarters of an inch in diameter. Have a blacksmith make an iron post eight inches long and three-quarters of an inch in diameter. A piece of iron should be welded at the lower end so as to make it three-quarters of an inch square for a distance of three inches. At the top form a square shoulder an inch long, and above it have a short round shank threaded to take a nut as shown in Fig. 9 B. Drive this shaft up through the square hole in the axle-tree, and to prevent it from dropping nail a piece of wood or tin over the end of it and to the under side of the tree. Slip the round post up through the plate and board so that it extends several inches above the top of the board. Make a tiller of hard-wood fifteen inches long and three inches wide at the post-end and taper it to the handle. Cut a square hole in the broad end to fit over the square shoulder on the iron post, then screw the nut on over a washer to hold the tiller in place. To prevent the tiller from splitting near the hole it would be best to bind the wood at both ends of the hole with copper wire as shown in Fig. 9 C. When the wagon is in motion a turn of the handle will operate the axle and steer the moving vehicle easily.
The wheels should be all the same size, but if they cannot be had and only a pair of large and small ones are available place the smaller ones at the rear. The axle need not run the entire length of the axle-tree, but shorter pieces may be bolted fast to the ends of the trees. Give the wagon two or three coats of paint and it will then be ready for use.