Originally Posted by Autodidactic player
Here is the exact rule:
The whole point of the Dynaspot is to "alter the swing moment of inertia" and "affect the performance of the racket during the playing of a point." The point of the lead particles in the Pro Kennex rackets, according to the manufacturer, is to reduce vibrations and make the racket more comfortable to use. Check out this study
So all dyanspot would have to do is say "our purpose is to reduce vibrations" and poof it's legal?