Window very hard to open

A handy person from Portland, ME says:
November 4, 2022
Hi Swisco! This building has many of these windows that won't open easily. There's a broken string in each side of the jamb, which I think is the main problem. Any ideas of how to fix and what to buy? Kind thanks.
-b
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Casey from SWISCO responded:
November 8, 2022

Hello,

It looks like the pulley cord for your channel balances that support the weight of the window sash has broken. We should be able to help but we would need to see an undamaged balance assembly fully removed from the window, along with the numbers stamped on the metal channel, to compare to our inventory. 

As for your sash stop, take a look and compare the dimensions shown on the 26-338 product page to yours. Thank you! 
Sash Stop
Sash Stop
26-338
$0.90
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