Old aluminum windows

A home owner from Texas says:
October 27, 2021
Spiral window balance on aluminum windows installed in 1968. The windows no longer stay up. No identifiable markings on the spiral balances or windows.

The length of each spiral balance is 21". Not including the metal spiral that sticks out a bit on the end..
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Emily from SWISCO responded:
November 1, 2021

Hey there!

This looks like a spiral balance for a non-tilt window. If that's the case, see either our Series 400 (3/8" diameter tube) or Series 500 (5/8" diameter tube). 
21" Series 400 Spiral Balance
21" Series 400 Spiral Balance
S400-21
$9.85
21" Series 500 Spiral Balance
21" Series 500 Spiral Balance
S500-21
$8.39
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How to Identify a Replacement Spiral Balance
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How to adjust a spiral balance on a non-tilt window
How to adjust a spiral balance on a non-tilt window
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