I have an nCode 6-1 95 ... the piece of plastic at the butt of the racquet (which has the W on it for Wilson) is loose ... when you bounce a ball on the racquet head, the stick vibrates a lot. I can still play with it. When you really swing it, it does not seem to vibrate. Seems the frame is fine (not cracked or anything) but something is loose in the base of the handle that causes vibration .... is this something that can be repaired? Thanks.