Originally Posted by PimpMyGame
Hate to say it but your friend has just invalidated the warranty on your racket. Although I agree that it is likely there is no damage, Head don't insist on 2 piece for nothing.
Changes are that racket is more than one year old. What warranty are you talking about. If the racket is at some later time strung as two piece how will Head ever know it was strung one piece.
One piece or two piece does not matter any more. If you like the one piece better keep it that way if not do it two piece. No need to worry about a warranty.