The kopa, also called a tāwiri, was an invention for squeezing the juice from tītoki berries. It was a flax bag in which the berries were placed, then pounded to release their juice. The kopa was squeezed by twisting it between two pairs of wooden handles. The juice was then filtered through another bag, and dripped into a container underneath.
Te whakamahi i tēnei tūemi
Te Ara - The Encyclopedia of New Zealand
Reference: Elsdon Best, Forest Lore of the Maori, Wellington: Dominion Museum, 1942
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