Milgard window spring

A home owner from Elk Grove ca says:
June 15, 2019
This is left spring of a double hung Milgard window
Marking 30 5 IX CMC 9
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Thumbnail of the uploaded file named image.jpg
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Tom from SWISCO responded:
June 19, 2019

Thanks for posting. Start by looking at our S385-31 channel balance. I think this looks very similar to what you have, but let me know if you agree. It comes with a 19-005 top and 15-004 bottom nylon fitting.
A home owner from Elk Grove ca says:
June 19, 2019
How do I know which sash weight to get.
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Tom from SWISCO responded:
June 20, 2019

Your old stamp of "30 5" usually matches up with our 3050 option, but you can weigh your sash on a scale and refer to the chart on our S385-31 store page to be 100% sure. Any common bathroom scale should do.
31" Series 385 Channel Balance
31" Series 385 Channel Balance
S385-31
$11.30
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