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Older sash windows stay up through the use of a rope (called a sash cord) and a counterbalanced lead weight, designed to match the weight of the sash. The sash cord is attached to the side of the sash, runs up the frame and over the top of a small pulley wheel, and then down the other side (hidden behind the frame) to a lead weight. When the sash is raised the weight is lowered, and vice versa.

In modern sash windows and some new timber sash windows, the sash cord and weight system is replaced with spring loaded balances, which are tensioned to make sure that they hold the sash in place rather than pulling it up or letting it drop.

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