Broken balances

A home owner from Santa Cruz, CA says:
both of the S385-27" (2640) balances that I purchased in March of 2012 have broken again. I think its just the string. Can that be replaced? If so is there instruction on how to do this? Is there something more heavy duty S385-27
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Tom from SWISCO responded:
I'm afraid the strings cannot be replaced. If your balances broke after only three years, the issue may be the spring strength. Let's go over that briefly.

Looking at your first discussion, your original balances were marked with "26 4," which corresponds to our 2640 option. Two balances with this option can carry a sash weight of 19 through 26 pounds.

However, this may not be correct. Did you ever find that your old balances didn't operate correctly? Can you confirm for me the weight of your sash? You can determine this by removing it from the window and placing it on a scale. This will allow us to confirm exactly what kind of stamp option will work for you, whether it be 2640 or something else.
A quick learner from Santa Cruz says:
Hello Tom,
The sash weighs 21 lbs, so by your description it looks like I have the correct units. The balances are inexpensive, so I'll just buy another pair, it just that the other window has lasted a decade. Maybe my kids abuse this window more. I'll order another set. Thanks for looking into it.
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Tom from SWISCO responded:
Sure, it is possible for a balance's life span to shorten if it's used a lot. Let us know if you ever need anything else.
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