Spiral Spring

A home owner from Honolulu, Hawaii says:
March 7, 2024
House was built in 1950. There are no markings on window nor the actual spring device. I know I will need to weigh the window in order to determine the spring rate required. The bottom 2" hinges and gets attached to the bottom of the window via two screws. I believe this is now a separate part from the tube. You sell them in packs of 25. Tube length is 27" as shown. Not sure which part number / style to order for the actual spiral spring tube.
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Thumbnail of the uploaded file named spiral balance bracket
Thumbnail of the uploaded file named spiral balance tube
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Emily from SWISCO responded:
March 8, 2024

Hi there! Thanks for reaching out to us. Have a look at the S500-27 spiral balance along with the 17-012 bracket (sold separately). This should be a good match but take a look at the specifications and see what you think.
Bracket, #32
Bracket, #32
17-012
$1.20
27" Series 500 Spiral Balance
27" Series 500 Spiral Balance
S500-27
$9.42
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