old wood windows spiral balance

A contractor from Lynchburg Virginia says:
Would like to purchase a spiral balance for my old wood windows. Lower sash only. Upper sash will be mailed in place. Sash weighs 21 pounds. Glass height is 28". Need the small foot bracket as well. Which spiral would you recommend?
John Sanchez
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Tom from SWISCO responded:
We usually recommend our Series 500 spiral balance for old wood windows, along with either our 17-007 or 17-012 brackets. Carefully review this hardware and let me know what you think.
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