Do you guys think this would be enough to send it in to tennis warehouse for a warranty? Another question : Could I exchange it for in store credit, and then with that, get the new Babolat Propulse 4's? (without 6 month warranty of course) One last question : Can I still use the return label provided with the free 2 day shipping? I read on the back of the receipt that its only valid for 60 days, so I'm unsure about it. Thanks.