Identifying an authentic K Blade 98 via strung weight... I am looking for a Wilson K Blade 98. I know that Wilson has not the best quality control. I asked the seller to tell me the strung weight of the racket as a criterion for me to judge whether it is a real one or fake. The racket will come strung which makes me doubt a bit because I read that K Blade 98 come unstrung... What else should I ask him to tell me beyond photos etc?