Plus-shaped Mounting Groove on an Arca Swiss clamp - why?

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karlx Regular Member • Posts: 425
Plus-shaped Mounting Groove on an Arca Swiss clamp - why?

I just ordered a mini clamp to add arca swiss compatibility to a mini tripod and a monopod.

I ordered this one: https://www.bhphotovideo.com/c/product/926450-REG/sunwayfoto_ddc_26_mini_clamp_26mm.html

Only after ordering I noticed that the bottom has a plus shaped groove.

Now I'm worried that the tripod screw won't be held securely enough.

Does anyone know what's the purpose of this groove?

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