FullTravelFree: you know before I posted the pictures of connector here, I asked a friend of mine, who is an aircraft mechanic with B2 licence. But he works on aircraft, not helicopters.
In his spare time he does some work on gliders and ultralights (he is also a glider pilot).
When I showed him a picture of this plug, he said: "I newer saw this socket or plug before, but you know what, go to CONRAD.COM and just buy banana plugs."
