Block and tackle

A home owner from Sugar Grove, Ohio says:
The width is 5/8" and the length is 30 1/4". Overall window height 32 1/4".
Sash weight 18.2 pounds.
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Thumbnail of the uploaded file named image.jpg
Thumbnail of the uploaded file named image.jpg
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Bob from SWISCO responded:

This balance looks rather unusual. I am checking with my senior colleagues to see if we can replace this for you. We'll get back to you as soon as we can with more information. Many thanks. 

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Paul from SWISCO responded:

I believe we can help with this balance, but we need a bit more information before we can proceed. First, can you tell me the stamp printed on the metal channel? Can you also tell me how many you need?

A home owner from Sugar Grove Ohio says:
The numbers stamped on the rail are 956 and I need 2. Is there a minimum order?
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Tom from SWISCO responded:

Thank you! There is a minimum order, yes, but as luck would have it, it's 2 balances. I'll email you an order link and price quote now for that quantity.

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