systems can increase a racquet's stability. It has been a main focus of improvement since the 1990's, ever since the introduction of a racquet called the Wilson Hammer. Similar to what it is named after, the racquet is "head-heavy" in that the top end of the product in relation to the handle is much heavier. The overall weight is comparable to more conventional racquets, but because of the weight configuration, a slight swing of the racquet makes it seem more powerful. Other weighting systems have been developed, with more emphasis on stability, rather than power. There are a number of ways to configure the weight in order to achieve what suits a player best.
             The configurations in figure 2 have been built into racquets, but can also be adjusted using lead tape. However, whenever a racquet's weight is changed, its swing weight is also affected. Depending on certain player preferences, different weighting systems suit best. In any case, the centre of mass changes which in turn affects the moment of inertia of the product ("swing weight").
             Weight in this position will make the racquet more stable, a bit less manoeuvrable, and slightly more powerful. And the sweet spot will be pulled down, a plus for players who tend to make contact near the throat.
             Weight placed at these two positions will increase the frame's power, significantly reduce manoeuvrability, add some stability to the racquet on off-centre hits, and stretch the sweet spot toward the upper edges.
             Lead tape that's placed on the handle, under the grip, will increase the racquet's weight with little effect on swing weight. This configuration best suits serve-and-volleyers who want a heavier racquet without sacrificing manoeuvrability.
             This configuration is twice eff: It expands the sweet spot toward the sides of the frame, adding stability on off-centre hits, and makes the racquet considerably more po...