How can a machine extrude a round pasta shape with a hole in the middle (e.g penne), without the middle metal part blocking the hole falling away

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How can a round shape be made, when the middle part of the metal creating the hole needs to be attached to something, which would create a gap in the shape

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How can a round shape be made, when the middle part of the metal creating the hole needs to be attached to something, which would create a gap in the shape

In: 479