Paul from SWISCO responded:
February 16, 2016
Looking at your photos, it looks like you have a 5/8" non tilt window balance. If so, you should consider our Series 500 spiral balance. Please compare the diameter of the balance tube and see how well they match. We will also need the height of the visible glass so that we can calculate the correct length. For the bottom sash bracket, see our 17-012, which is screwed under the sash.
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Paul from SWISCO responded:
February 24, 2016
Great, thanks! With that size, I'd go with a S500-16.
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