Pella pulley sash support system

A handy person from Elkhart IN says:
Pella window
Pella-0798-dscdhvc1z1-044m074atan-111sc11s-nfrc

Top pulley of a sash support system?
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Paul from SWISCO responded:

Thanks for posting. The balance manufacturer doesn't sell parts of their spring balance system, so you'll need to purchase the complete channel balance with the nylon fittings attached. If you need assistance identifying your balance, take a look at the video below.

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