Paul from SWISCO responded:
April 10, 2024
Hello, I do not believe that we carry an exact match for your balance assembly but we do offer a similar setup for your Hurd windows. I'd recommend starting by removing your pivot shoe to confirm that it measures 1" wide like our 15-167.
The balance would be our S770-35, which is screwed at the top and uses the 15-043 terminal clip to anchor the pulley to the pivot shoe. The spring strength option would be 35D based on your original stamp, which will support a sash between 27-32 lbs. Look over these parts and see what you think. Thank you!
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