See http://groups.yahoo.com/group/free_energy/ then go to files, then to pictures titled 9-27-08 Laithwaite’s figure 7.

3 photographs of Laithwaite’s Figure 7
From position one (photograph one) a small double lever is used to accelerate the pucks on the end of the string; one is accelerated north and one south (relative directions). The center puck is initially at rest and has a mass of 76g; the end pucks have a mass of about 32 grams each. That means the center of mass is closer to the center puck than to the end pucks.

As soon as the end pucks begin moving north and south the center puck begins moving right. When the center puck reaches the center of mass (which is about the center of the table) the end pucks are in the positions of photograph two, directly above and below the center puck. If the center of mass is to remain in position as Laithwaite stated then the velocity of the end pucks will be moving with half their original velocity, and the center puck will be moving with 64/76 *1/2 the original velocity of the end pucks. These velocities conserve linear Newtonian momentum, and the velocities also conserve the position of the center of mass. This is what the experimenter will observe upon doing the experiment.

All this motion is then returned to the end pucks upon moving from photograph 2 to photograph 3. In photograph three the center puck (now on the right side) is again at rest. The energy change from photograph 2 to photograph 3 is 217%. Start the motion in the center (photograph 2) and you can make energy.