BFS Single Hung Spring Replacement

A home owner from Helotes, TX says:
Trying to replace spring, see attached photos, length of spring unit is 28 inches metal to metal.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting! This resembles our S395-28 channel balance. Look it over and see if you agree. 27 9 is not a standard stamp, so you will need to get the weight of your sash and compare that to the chart we show on the S395-28 store page. That is the best way to determine which of our options is best.
A home owner from Helotes, TX says:
Thanks for the quick response, sash weighs 30 pounds so will get 2760 series.
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