I have recently acquired a plane (Carl Goldberg Super Chipmunk) with an on-board glow driver system in it. The system includes an external on\off switch, a throttle servo actuated switch, and an external charging port. The component in question here is this port. It is a small, silver, round port, about 1/8" deep. It has threads on it as if the charger can attach to it securely. I am trying to find a charger that will adapt to this type of port. If anyone has an idea as to what type of system this is, please chime in. I will attempt to get pics of it ASAP. Thanks.