The ViVi Nova replaced the Stone line. Now I know why the 1st run of the nova had longer center + pins. The one on the stone tank is to short! GD!!!!! K I feel better now. Does anyone know of a shorty 510-510 that will not screw down flush to the tank? I am getting no air flow and its causing the stone to flood and leak. If you dont vape hard on a VS it will leak at the connection.