Need to identify replacement parts I need for window coil

Home Owner
My window hasn't been staying up right so I opened it and found out that I may need a new coil.
User submitted photos of a coil window balance.
6 Replies
Tom
Tom from SWISCO
SWISCO
Expert
I agree, looks like those springs are shot. First, look at the shoe. That appears similar to our 15-175. Can you confirm? If so, I recommend our Series 152 coil springs to replace your old ones.
Home Owner
Seems like the right shoe. What weight should I get for the balance. Mine has the letter "C" on it.
Tom
Tom from SWISCO
SWISCO
Expert
That doesn't match up to any of our stamps. What is the weight of the window sash?
Home Owner
The window weighs around 10 pounds.
Paul
Paul from SWISCO
SWISCO
Expert
Great, thanks. I recommend our S152-5 spring. Each individual spring can carry 5 pounds.
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