Usually, when it sounds as if the "loose" part is in the head, it is actually in the handle. PK has replaced rackets for me before, but that was before their restructuring. Their customer service USED TO BE the best in the business. Now, it's tough to get a live person on the phone. In the past, you call, get a Return Authorization number, mail it back. 4-6 weeks later, you get your new racket (if it had something wrong with it). They are based in California, so make sure you have the correct time zone you are calling. Otherwise, return it to the place you bought it. They can usually help. Maybe PK is only dealing with its authorized vendors now.