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Jasmine from SWISCO responded:
July 31, 2023
Good Afternoon, Thanks for writing in! Your coil balance housing looks similar to our 15-087 Coil Housing Pivot. Carefully review and compare the dimensions to those shown below to determine if these are the correct replacement. Although, I am confident these are the replacements you'll need. You'll also need the 15-086 Tandem Coil Housing. 
Detail of 15-087
The coil housing pivot and the tandem housing are both compatible with the Series 180 coil balance spring. Since your sash weighs 23lbs, I suggest using (4) of the 6lb coils, part S180-6. These should work fine as a replacement for your hardware. You may also need the 16-024 Mounting Bracket. |
