basically got another k six.one tour 90 really cheap, it feels same as my first one, but on newly bought racket it says made in china on the bubble cap, wheres as my first k90 doesnt but both do say on throat designed in US made in china. how would i tell if its fake? is it easy to take off bubble cap n put it back on and how? Is their a seriel number where i can give out to wilson to see if that they can say they have made it? what should i be looking out for?