This is a broken spring from a single-hung, alum. frame window

A home owner from Parkland, Florida says:
October 25, 2020

When I measure the channel width with calipers I get 0.6" and a depth of 0.61" (this is measuring the metal spring casing). The metal casing is 31" long. The end fittings are winged. These are original windows from a home built in 1984. There is a stamp on the metal spring casing that looks like 3020(Z)?. The last digit/letter is a guess. It looks mostly worn away.

I'm going through all of the windows in our home and they all seem to need springs it seems. This is the worst one and I'm starting with it.

Thank you for your assistance!

Keith

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Bob from SWISCO responded:
October 28, 2020

Hey Keith. This might be our S377-31, but check to make sure the bottom fitting matches our 15-005. You'd need a stamp option of 3020.
31" Series 377 Channel Balance
31" Series 377 Channel Balance
S377-31
$11.52
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