Tom from SWISCO responded:
June 9, 2017
Your pivot shoe looks like our 15-180, which is commonly used with the Series 190 coil spring. See what you think.
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Tom from SWISCO responded:
June 13, 2017
Yes, if the number on your old spring reads "7" then our S190-740 would be the best option. Each of these springs is rated to hold 7 pounds, so if you have two springs altogether then they are meant to hold a 14 pound sash. If you have four springs altogether, they're meant to hold a 28 pound sash, and so on. You can always weigh your sash on a scale to confirm that these are correct.
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