one of these days I'll look thru the photographs (I was doing a shoot with Billy Black) and another of these days I'll figure out how to post one, by which time everyone will have forgotten this conversation.
There is no headboard on this particular sail and the head of the sail is not attached to the sail track by any kind of car . . . it just flops down when the halyard is eased. A line connects the top corner of the sail to the car for the uppermost horizontal batten. As you take up the last of the luff tension, it simply pulls the head of the sail against the mast. Bit cheap and cheerful and I'd wonder about longterm issues with chafe . . .