SWISCO - The Replacement Hardware Authority

Need to identify replacement parts I need for window coil

A home owner says:
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.
Profile picture of Tom
Tom from SWISCO responded:
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.
A home owner says:
Seems like the right shoe. What weight should I get for the balance. Mine has the letter "C" on it.
Profile picture of Tom
Tom from SWISCO responded:
That doesn't match up to any of our stamps. What is the weight of the window sash?
A home owner says:
The window weighs around 10 pounds.
Profile picture of Paul
Paul from SWISCO responded:
Great, thanks. I recommend our S152-5 spring. Each individual spring can carry 5 pounds.
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