Wocd on historic sashes

Thanks for writing in. We carry a balance system that wood window manufacturers used in the 1940's, our Series 500. This is a 5/8" tube spiral balance. It is often used with the bottom sash bracket, the 17-012, which attaches to the bottom of the spiral. From the photos, it is hard if these sashes used this method or another. But take a look and see what you think. Also take a look at the other parts associated on this page if you need them.