Wanted: Signals Spool for cable reel

[derk derin]

Hi All,
I just finished cleaning up this cable reel backpack and now am in search for a spool to finish it off. I believe this is WWII era? And doing internet searches I found no images showing this backpack in use but the different types of spools out there show I am probably looking for a wooden spool of a British design. The metal spools seem to have too small a square for this particular backpack. The square part of the crank rod assembly is 5/8”. The width of the mounting rod is maximum 6 3/4” wide so probably looking at 6 1/2” wide spool and a spool with a diameter of 10” will fit.
If anybody has a spool they are willing to part with or know of one for sale I would appreciate hearing from you.
Thank,Derk
P.S. I would love to find any images of this backpack in use if anybody comes across one!