We need to replace a coil spring. Please see attached photos. (The full coil is not shown in Photo IMG_2668 because part of it snapped off). The coil is stamped #832. See IMG_2672. Window is likely original to the unit (~1990), but I can confirm if necessary. (This is for a rental property).
Also, should we replace both coils (L & R) at the same time? I presume the cartridges are okay, but let me know. (Also, if the coil comes preloaded onto a new cartridge, then that may be a good option as well).
William
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Lauren from SWISCO responded:
May 8, 2023
Hi William, thank you for posting, Your pivot shoe resembles an older version of the 15-180 that is compatible with the Series 190 coil springs. For a coil marked with #832, please review the S190-840 coil spring. This coil can support 8 pounds of weight, together with the assembly on the other side of the window, the window sash should weigh 16 pounds total. The pivot shoe and coils are sold separately. We recommend replacing both sides at the same time to prevent the newer balance from wearer out faster. Please review and let me know if you have any additional questions! 
Alternate image for 15-180
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