Spiral balances

A quick learner from new jersey says:
I am replacing spiral balances in my Victorian wood sash windows but do not have the old spirals. How do I measure for the new ones? What type do you recommend?
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Paul from SWISCO responded:

Hello,

To determine the balance tube lengths of wood windows, you can use this formula. For the top sash measure the glass height and add 1" for the bottom sash add 3". Example would be if top sash glass height is 16" the Series 500 balance will be 17" and bottom sash glass height is 16", the Series 500 balance will be 19". Below is a generic directions for installation.

For your wood sashes, you will need our Series 500 balances with 17-012 balance brackets. These brackets hook on the balance spiral. To install these balances, you would drop them from the top on the side of the sash. Use 33-017 screw to attach the balance tubes at the top. Now raise the sash and have someone hold it up while you attach the bottom bracket 17-012 with 33-090 screw while the U-shape opening corrals the spiral. With your finger bring up the spiral to the bracket and attach the #75-005 tool and turn the spiral clockwise three turns and hook it to the fork of the bracket. Repeat the other side and try the sash. If sash creeps down, raise and hold up the sash and give the balances another turn or two.

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