Andersen Sash balance rope replacement; can I ?

A quick learner from Ithaca NY says:
I think replacing the rope with sash balance isn't feasible or is it? These ropes are a major short coming of these sash balances if humidity is high humidity environment. Roughly 50 percent of my 30 year old ropes have snapped.
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Tom from SWISCO responded:
No, unfortunately, it isn't feasible or recommended to replace the sash balance cord. It's far easier to just replace the whole balance, in the long run. Do you need help picking a balance?
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