According to TWU, adding weight near the tip (12) and/or the middle (6) of the racket reduces racket frame vibration significantly.
Adding weight at 3/9 or near the top of your grip, have minimal affect on racket frame vibration.
I tried this on my frame and I noticed significant frame vibration reduction when adding weight at 12 and 6.
When you customize a racquet by adding lead tape, you reduce the vibration frequency. More mass is more difficult to accelerate into vibration, and the racquet will therefore feel softer. The degree of vibration reduction will depend on where you add the weight. If you add it to a vibration node (just below the middle of the head or at the top of the hand on the grip) the frequency will change very little, if at all. If you add it near the tip or the middle of the racquet, vibration will decrease more.
Source:
http://twu.tennis-warehouse.com/cgi-bin/vibfrequency.cgi
Adding weight at 3/9 or near the top of your grip, have minimal affect on racket frame vibration.
I tried this on my frame and I noticed significant frame vibration reduction when adding weight at 12 and 6.
When you customize a racquet by adding lead tape, you reduce the vibration frequency. More mass is more difficult to accelerate into vibration, and the racquet will therefore feel softer. The degree of vibration reduction will depend on where you add the weight. If you add it to a vibration node (just below the middle of the head or at the top of the hand on the grip) the frequency will change very little, if at all. If you add it near the tip or the middle of the racquet, vibration will decrease more.
Source:
http://twu.tennis-warehouse.com/cgi-bin/vibfrequency.cgi