Vinyl window parts

A handy person from Greensboro, nc says:
I'm purchasing a condo and one of the windows is not working correctly - basically it doesn't stay up. I can see the balances are not working as they should. Can you let me know what parts I need to purchase?
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Bob from SWISCO responded:

Thanks for posting. This looks like an S795-28 balance with either the 15-195 or 15-195B shoe attached. This blog article here should tell you all you need to know about these balances. 

How to Install a T-Lock Shoe on a Channel Balance
How to Install a T-Lock Shoe on a Channel Balance
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How to Convert a Crossbow Balance to a Channel Balance
How to Convert a Crossbow Balance to a Channel Balance
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How to install the 26-200 Screw Plug
How to install the 26-200 Screw Plug
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Modifying the Series 795 Balance
Modifying the Series 795 Balance
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Classifying Channel Balance Fittings
Classifying Channel Balance Fittings
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