Lauren from SWISCO responded:
June 2, 2023
Hello, thank you for posting, Your balance assembly resembles the 15-180 pivot shoe that is compatible with the Series 190 coil springs. Based on the stamp, please review the S190-940 coil. This coil alone can supports 9 pounds of weight. With both assemblies together, it can support a 18 pound window sash. We recommend obtaining the exact weight of the window sash to confirm this! Please review and let me know if you have any additional questions. Alternate image for 15-180
|