I AM USINGA A HEAS SPEED PRO (310gm unstrung) with following customizations :
1. leather grip with adds 5gm extra
2. lead tape of 4gm at positions of 3,9 and 12 o'clock
3. 5 gm silicon in handle
WHICH MAKES THE UNSTRUNG WEIGHT OF RACKET TO 332gm
due to which I am able to produce more spin and...