The International Tennis Federation or the ITF dictates the placement of your vibration dampener. You can place it in one of two places. Either below the bottom cross string or above the top cross string.
To install, simply locate the “back” of the dampener, there is a piece of the dampener that connects the four segments together that will identify the front from the back. To install, simply do one section at a time, pulling the strings apart; the front side should be closest to the string bed.
The placement of a vibration dampener is dictated by ITF rules, which state that you can only install one below the bottom cross string or above the top cross string. You can slide it up or down to...
At the base near the throat of the racquet before the first cross string. That is the only logical spot for vibration dampener and that is why you always see players insert their dampeners at that spot. At the top of the racquet, where there is very minimal space. At the extreme left or right of the racquet frame.
The idea here, as the name suggests, is to dampen the vibrations traveling through your racket and into the arms. It has been proposed that having a vibration dampener on your racket reduces the chances of sustaining a repetitive strain injury such as tennis elbow (more on this in a second). Do Vibration Dampeners Reduce the Chance of Injury?
Basically, a dampener is a small piece of rubber that you insert between the strings of your tennis racket. Originally the vibration dampener was invented by René Lacoste in 1964. The aim of his invention was to reduce the vibrations of the racket during ball contact and thus protect tennis players from arm injuries.
A vibration dampener (or damper) is a little thing you add to the strings at the bottom of the string bed to reduce string vibration. Is there a specific place where a dampener has to go? Yes! According to the USTA's Official Rules of Tennis, a vibration damping device “may only be placed outside the pattern of the crossed strings” (Rule 4, Case 3). Check out this photo to see what that means:
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