Maklike does have a very valid point. I think what he's saying is that the racket head and shaft, once out of the manufacturing plant are set in properties. After that point, you cannot change the weight or BP since the mould has been caste. If the racket is supposed to be for example, 305mm BP, but the BP turns out to be 310mm. The manufacturer cannot change the head and shaft, but could simply add weight in the handle to compensate for the heavier head to re-adjust to 305mm BP. Remember, racket weights are always given a 5g level of leeway (3U is 85g-90g for example) so they could technically add weight to the handle without really going past the designated weight allowance. A 2g difference in weight with an overgrip changed my BP on my VT80 by a whopping 8mm. This just shows how even a slight weight variance can change the BP of a racket considerably.