The tension in the main strings tries to make the string area of the racquet shorter, and when it gets shorter, it will also get wider. Modern stringing machines apply one of two different racquet support principles:
1. DIRECT SUPPORT
When the racquet frame does not get shorter it does not get wider either. The main strings pull the racquet frame inwards making it shorter . Direct supports push the frame outwards and prevent it from getting shorter .
2. INDIRECT SUPPORT
An "indirect" support system has four supports supporting the outside of the racquet frame. Outside supports prevent the racquet frame from distorting wider. Because getting shorter is the main problem, a racquet support with outside supports prevents it from getting wider with an indirect racquet support.
3. "RACQUET FRIENDLY" WITH WIDE SUPPORTS
The force between the supports and the racquet is very high. Wide supports result in a lower pressure between the support and the racquet and a less chance for damage to the racquet.
4. THROAT-SIDE: THE BRIDGE IS VULNERABLE
The bridge is a separate part, glued in between the throat of the racquet. The main strings try to pull the bridge away from the handle. Therefore it is very important that the bridge is supported thoroughly with the added security of wide supports.