you have on ebay for gopro 3, open lock to end, then just push it to front of camera, it will snap off housing. Link from ebay: http://www.ebay.com/itm/191136175304?ssP...
i have buyed one gopro with that problem. I have repaired it, works as new, but there you need to solder ultra thin wires to motherboard where was before strip. If you want to sell your gopro, contact me.