This is very often the worst way to do it.
Here's the problem. You have a racket that becomes to light for you and you'd like to add weight. No problem, so far. But if the racket is already head heavy and they want the weight added to the head.
You will be making a head heavy racket, even more, head heavy. The racket will become less maneuverable and tougher to generate racket speed with. Think of it this way. How maneuverable is a sledgehammer? Sure, assuming you can swing the thing, there may be power, but with the cost being the loss of maneuverability and stability.
An even better option if using a head heavy racket is to add the weight in such a way as to make the racket both heavier and less head heavy. There is a reason that the racket companies all do the same thing. As the rackets they make get heavier, they also get more head light. This adds maneuverability and the ability to get racket speed while also making the racket more stable. The more head heavy a racket is, the further from your hand the weight is, making it less stable.
Everyone is different. If you need a racket heavier, stop into our Dale Mabry store and we can show you the best way to add weight to your racket to achieve the feel and performance you are looking for.