Fig. 328
Fig. 329
Fig. 330
First cut two pieces of wood, 10¼ inches by 1¾ inches (the sides of a wooden chocolate box will do when sawn the right size and filed), and shape them as in Fig. 328. Saw slits in both pieces at G, ¼ inch wide and ½ inch deep. If two saw-cuts are made for each slit the wood between can be cut away with a pen-knife. These slits must be about 2¾ inches from end, b d.
With a round file make semicircles at c and e to hold the rollers on which the engine is moved into position.
With a bradawl and round file make holes, F, in both pieces about 3½ inches from end, A (diameter of hole about 3/8 inch, or larger if a larger windlass is required).