SWISCO - The Replacement Hardware Authority

2 questions re old sash windows

A home owner from Detroit says:
While I am reasonably adept at repairs I just don't have time to replace ropes and wights in several windows that won't stay up without a prop. I have been told that there is some sort of flexible spring steel bit of hardware that fits in channel that will hold window up. True or just wishful thinking?
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Paul from SWISCO responded:
We may have something for you. Check out our 20-001 Wood Window Sash Tension Spring. Is this what you're looking for? Let me know what you think.
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