Does anyone know what this is?

I was looking for flash brackets and grips and things - bought this on eBay for three quid, and I'm using it until I find something better. It has tripod connectors top and bottom, so does the job Ok.

But the trigger operates something inside, visible through the hole with the screw thread.

Anyone know what it really is, and what would screw into the hole?

Total Guess Here - does the trigger fire an old fashioned cable shutter release mechanism?

(something like http://www.enjoyyourcamera.com/product_info.php?language=en&products_id=209 )

Could it be a part of, or a clone from the Novoflex lens system?
It sure looks like that.
regards,
martin

Could be for one of those shoulder mounted camera/lens bracket things for a shutter release??

Just guessing of course.

AKA Novoflex lens system
But you described it way better

Best regards,
Martin

I wouldn't try using it if the Mtropolitan Police are around.