Balance question

A contractor from Sandpoint,Idaho says:
I have 28" SERIES 350 CHANNEL BALANCE that are 2730.

They have broken over the last ten years . It is always the string. If I go to a 2740. Does the sting increase in strength ? or just the spring
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Tom from SWISCO responded:
Well, that's actually a somewhat complex question. The stamp represents the strength of the spring, but this can often lighten the strain on the string. Every component in a balance works closely together. They're precise systems. However, it's important to keep in mind that it is possible to have a balance that is too strong. I highly recommend weighing your sash on a scale and referring to the chart on the S350-28 store page. That will tell you exactly what you need. I would not go heavier. The average lifespan of this kind of balance is around 5-10 years, depending on how often the window is used.
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