Window winder for my window

A home owner from Annapolis says:
Please help
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Paul from SWISCO responded:

Hi there! I'm very confident that we can help you with this project.

It looks like you have an old discontinued Keller Series 303 single hung window. What you're showing specifically are the bottom white sash clips, which match our 17-018 and 17-019. The black balance shoe is our 15-010, which attaches to the spiral with a 62-001 rivet. 

To be honest, you might do better replacing the complete spiral balance with our Series 303 balance. This comes complete with the 15-010 already attached. Ultimately it's up to you.

Let me know if you have any questions!

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