Paul from SWISCO responded:
September 21, 2016
Hello, Scott! Hopefully we can help. Your pivot shoe resembles our 15-177, which leads us to recommend the Series 152 coil spring. Based on your packing slip, I would recommend the S152-7, but you may want to weigh your sash just to be sure. Two S152-7 springs can carry 7 pounds each on each side, which adds up to support for a 14 pound sash. If your sash isn't 14 pounds, let me know and we can try to work something out.
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