Why is the neck peg cylindrical, while the hole is a hexagon?

hottoy 0 6

Why is the neck peg cylindrical, while the hole is a hexagon?

I want to make a custom nendoroid head but stumbled at the neck part because I want to make sure the hole in the head fits the neck. I'm not sure where to ask about this.

submitted by /u/Explorer_XZ to r/Nendoroid
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