Is there any data on your tripod? On mine it was on one of the metal bands about 8" from the top of the leg.
The size of the threads almost look like it would fit the heliograph, although my heliograph has a different (earlier?) design of a tripod,.
dited to add: nevermind, I see your 4th photo now. So yours is a no17mk2, and mine is a no17A mk2.
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