Jam blocks

A handy person from coulmbus Ohio says:
I have windows that are two years old. I have noticed air flowing thru the window jams. They are vinyl double hung/ single hung windows. I can't seem to find these anywhere. Could you advise. Thanks
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Paul from SWISCO responded:

May we see some photos of the part you are describing to us?

A handy person from coulmbus Ohio says:
Sorry, it is just wedged in the jamb. Maybe a jamb plug?
Thumbnail of the uploaded file named D3BA0A24-1FFA-4F6F-BCAA-C22D5EF6EF19.jpeg
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Paul from SWISCO responded:

We carry one similar to yours, our 26-139, but it has a hole for the Series 600 balance. Yours is for a coil balance system. It isn't a critical part of the window, but nice to have. Look over and see if you can use our hole aligner.

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