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It always sounds good in theory to cover the ring on the end of the neck, but sometimes it is not possible. It all depends upon the diameter of the ring and diameter of the interior of the mouthpiece shank. For example, on my SBA alto the ring is just .44 mm smaller than the inside of the mouthpieces I play. That means the cork would need to be sanded down to around .25 mm to fit. Even if that could be done, cork that thin on the end of the neck would never last very long anyway.