Casey from SWISCO responded:
June 15, 2023
Hello, I would recommend starting by comparing the specifications of the S765-21 channel balance to your assembly. The 20 3 stamp indicates that you would need a 20-3 strength option to support a sash between 10-15 pounds. This balance assembly is commonly used with the 15-046 pivot shoe and 26-040 pivot bar but you would need to compare the dimensions below to confirm they match up to yours. Keep in mind that the width and thickness of the pivot shoe, as well as the backset of the installation hole in the pivot bar, would be the key dimensions. See our video below showing the cutout method to remove your pivot shoe from the window jamb. As for the pivot bar, there is a good chance that the top sash would use the same pivot bars as the bottom but it would still be a good idea to remove the original from the top sash, even if it is broken, to be sure that it matches the part you removed from the bottom. Alternate image for 15-046
Alternate image for 26-040
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