The end of the hook that the sail line is fastened to passes down thru a small hole in the end of the small stick _e_. A weight, _p_, is secured to the lower end of the mast to prevent overturning of the yacht, and a piece of light cardboard is used for the hull. =The pulley wheels= can be turned on a lathe or small metal ones, especially aluminum can be used. Strips of tin make good frames for the wheels, and are attached to both sides of the beams. If wooden wheels are used, care should be taken to see that the holes are in the center. Wire nails make good axles. The kite line is liable to jump out the grooves of the wheels, so small screw-eyes placed in the beam just in front and behind each wheel will keep the kite line in place. It may be an advantage to press the eye together some so as to make an elongated hole, Fig. 142. Some care will be necessary to see that the screw-eyes are screwed in just the right distance so as to prevent the string from resting on the screw-eyes instead of the grooved wheels. [Illustration: FIG. 144.] [Illustration: FIG. 145.] [Illustration: [TN: Image missing] FIG. 143.] =The Release.= The sail is tripped by the stick, _e_, being pushed against an obstruction of cardboard fastened perhaps three hundred feet from the kite, see Fig. 143. The reason for placing it away from the kite is that when the weight comes on the kite line, the last part of the trip is very steep; by placing the obstruction some distance from the kite this difficulty is largely overcome. As a final warning, the sail line should just be tight enough to hold the sail in place while going up and not tight enough to prevent easy tripping when _e_ touches the obstruction disk. Some put on elastic bands to pull the sail down quickly when it is tripped. The nearer the sail can float out straight behind on the return trip, the less resistance there will be to the breeze. Some even go so far as to have a little rolling up device for the sail. A thread should be attached to the beam and to the little rod _e_ to prevent its falling out on the down trip.