Sunair 2740 AF BSI Window Balance Issue

A home owner from Laguna Hills, CA says:
I need to fix hard to open/close Sunair window 28" channel number 2740 AF BSI. Please see pics and advice on various components.
For some the string is broken, do i need to buy the whole channel or should I replace the string inside the channel?
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
Thanks for posting. See our S350-28 channel balance and let me know if this would be a good match.
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