Consejo Regulador de las Denominaciones de Origen "Jerez-Xérès-Sherry" - "Manzanilla-Sanlúcar de Barrameda" - "Vinagre de Jerez"
In the cooperage this refers to a special curved blade with a handle on each end used for scraping the wood of the butt.
That topping up process by which a row of butts is replenished with an amount of brandy equal to that which has been drawn from it. The first criadera fills the solera. This operation is known as 'running the tiers'.