Hi. First post, so my apologies if I break any guidelines...
I have a vintage Japanese wooden field camera, brand name of Ishibashi, probably dating from the early 20c (has dry plate holders). The tripod nut seems to be a 3/8 size, but my Gitzo 3/8 adapter won't screw in, and neither will a standard 3/8 bolt.
I suspect the pitch of the thread is 'non-standard'.
Correct me if I'm wrong, but I believe the standard 3/8 is 16 threads per inch for cameras and normal bolts. I'm wondering if the tripod nut my camera might be a 3/8-24TPI. Would that make sense?
Here's the camera...