My Bluedio T3 hinge pins need replacing

I have a pair of Bluedio T3's and I have somehow managed to shear the hinge rod/pin off of one of the hinges that allow the headphones to fold up. These appear to be spring roll pins or tension pins. I was wonder if anyone has a good idea what size pins these are (they seem to be between 2mm and 3mm in diameter) and whether or not I could just use a new pin to punch out the pieces of pin still left in the hinge.