Kuna kobaravarred on rohekalt mõrkjad ja sisaldavad teravamaitselisi happeid, püütakse enamasti need marjadest eemaldada juba enne pressimist. Selleks on kasutusel varretustaja-purustaja (destemmer-crusher), mis kujutab endast suurte avadega perforeeritud trumlit, mille sees asuvad tugevad sõrmed.
Many destemmer models can be combined, often as an option, with a crusher. The crusher can be incorporated into the destemmer or be removable or retractable.
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