measurements of 7x17 film holder

[mark]

I am drawing up plans for a 7x17 camera and I want to make my own holders too. Used ones are proving impossible to get. These have never been on Ebay when I am.

If it is not too much trouble would someone please give me the Over All dimensions, and the dimensions of the film opening. I have no idea what the real name is. I would also need the distance from the inside edge of the rib to the film opening and width of the rib.

Thank you very much in advance.

 

[rogein]

FWIW here are the 'specs' Sandy King gave me last year for his S&S holders:

"The width of the 7X17 holders is 21.75cm, the length from the end of the flap to the beginning of the rib-lock is 46.45cm. The T-distance is 8.5mm."