Braided 2mm cord for Andersen Counter Balance

A handy person from Sterling, VA 20164 says:
Hello,

I am working with Andersen 3046 double hung (around 1978) windows and Andersen 1626043 counter balance (has number 11600-2 stamped on it). I believe this is Swisco 24-431 Sash Balance. In about half the cases I will be able to rebuild the counter balance assembly but I would like to use the same type cord as it seems very strong. It appears to be 2 mm braided nylon (several small strands braided). Could you identify a source where I might order a small quantity of this cord,? I have several windows I'm repairing.

Thanks,

Rob D.
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Mike from SWISCO responded:
Good Morning,

The replacement Andersen operator boxes we sell are genuine Andersen replacement products. Andersen does not sell the replacement string you are asking about. I do know where you could find replacement string like that. I would start local at your mom & pop hardware stores and see if they have any suggestions. Sorry I could not be of more help.
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