Double Alenco windows

A handy person from San Angelo, TX says:
May 7, 2020
Photo of Manufacturer's tag is included. One window will raise with great difficulty, the other doesn't seem to want to raise at all.
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Bob from SWISCO responded:
May 11, 2020

This looks potentially like a Series 306 Non-Tilt Spiral Balance. You'll need to confirm that diameter of the tube is 3/8", and that the bottom bracket shoe matches the 15-066. Let us know if any of these specifications differ. You'll need the length of the outer tube to confirm the length of balance you need. Let us know if you have any other questions.
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