Cut The Connecting Crosspieces B of the length shown in Fig. 560, by the width of the notches, and nail them in place. Then brace the ends of each with the corner irons D (Fig. 559), screwing these to the runners and to the crosspieces, in the positions shown.
Crosspiece C on the bow sled (Fig. 558) is The Foot-bar.
Cut it 18 inches long.
The boy who steers the bob-sled rests his feet against the projecting ends of the foot-bar. After nailing the bar in place, drive a screw-eye into each end, as shown in Fig. 568. Tie The Steering-Line ends to the foot-bar just inside of the runners, then run them over to and up through the screw-eyes, as shown. By this arrangement, the feet of the boy who steers will be kept from slipping off of the foot-bar by the steering lines.
Figure 562 shows a pattern for The Sled Seats. The stern end may be left square if you like, but rounding it as shown will give it more style. Nail the seats in place, using long enough nails to clinch upon the under side of the braces.
With the sleds completed, prepare The Bob-undersidecting Seat (F, Fig. 563) of the size shown, then the connecting blocks G, H, I and J (Figs. 563, 564 and 565). Make blocks G and H in one piece (Fig. 566), bore a 3/4-inch hole through the piece at the center of its length, for the king-bolt, and rip in half as indicated by dotted lines. Nail block H to the under side of seat F, and block G to the seat of the bow sled. Bore a hole through seat F directly over that in block H. Figures 563 and 564 indicate how the king-bolt runs down through seat F and block H, then through two iron washers, through block G, seat, E, a third washer, and the nut.