Replacement balance(s)

A handy person from Cape Coral. FL says:
February 8, 2012
This is for a single-hung window.

I could not find any identifying markings, etc. Pictures are attached.

Length 30" and width is 1/2".

Thanks,
Tom
User submitted picture of channel balances for NuAir windows.
Profile picture of Tom
Tom from SWISCO responded:
February 13, 2012
Thank you for submitting your pictures, Tom.

We're going to need a few more pieces of information from you before we continue.

First, since your channel doesn't include any stamps, please give us the weight of the window sash so we can determine what strength you'll need.

Second, please take a look at this attachment guide and see if you can identify your bottom attachment:
Swisco Channel Balance attachment guide.
A handy person from Cape Coral, FL says:
February 13, 2012
Looks like it's attachment #15-004 (has wings and measures 1 3/32)

Window sash weighs approx. 15 lbs.
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Paul from SWISCO responded:
February 14, 2012
Thank you for the information. In that case, please take a look at our S385-30 Channel Balance with a 2920 stamp option.
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