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Casey from SWISCO responded:
September 1, 2023
Hello, Your channel balances resembles the S770, which attaches to the top of the window with a screw and anchors to the pivot shoe with a terminal clip at the end of the pulley cord. 
Close up view of the Series 770 balance top.
Close up view of the Series 770 balance bottom.
If the pivot shoe is the part that broke, I would recommend removing yours from the window to compare to the 15-129 shown below. Take a look and thanks for posting! 
Detail of 15-129
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Casey from SWISCO responded:
September 5, 2023
We do offer a 19B strength option for the S770-19 channel balance, which is also referred to as a block and tackle balance in the industry. The 15-129 is often used with the S770 but we would need to see your pivot shoe uninstalled, along with written-out dimensions, to confirm if a closer match is available. |
