For context, this is a (rather old) Cullmann 2502. The head features a slot (30 x 5 mm) with two set screws on the front facing side (see other pictures). I thought it could be a mounting point for accessories but could not find any info online…
Front face with set screws:
Full tripod:
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Could the slot fit this accessory?
I’m giving you a wild guess, but I suspect it’s to mount an arm to hold a flash, alternatively it’s for a handle so the head can be rotated smoothly with a video camera mounted.
This looks like a contender:
![[Gear talk] What is the purpose of the slot in the head of this tripod?](https://lemmy.world/pictrs/image/ffc4b148-1be7-4af6-9c21-609492c46e28.jpeg){kind=link}