window balance

A handy person from Minnesota says:
What kind of balance do I have? It is 21 inches long and has the markings 21 S HF 24.
User submitted image of their window hardware.
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Paul from SWISCO responded:
Thanks for p o sting. I believe your balance is a match for our S770-21, but I'm not totally sure if the clip at the end of the cord is the same as what comes with our balance. See what you think. As for the stamp, yours doesn't match any of our options, but I think one of them may still work. I recommend weighing your sash on a scale to confirm the best match.
A handy person from Minnesota says:
Yes, I think you might be right. I will weigh my sash in the next couple days and get back to you. Thank you.
How to replace a tilt-window channel balance.
How to replace a tilt-window channel balance.
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