spiral measurements

A contractor from Cooperstown says:
July 6, 2017
Hello,

I need to order some new 500 spirals. The old spirals no longer have a sleeve so I am unsure how to measure them. windows are 40" tall and I think I need a 38 or 39-inch spiral. Photo below. Thanks
spiral balance
Profile picture of Paul
Paul from SWISCO responded:
July 11, 2017
Thanks for posting. I would recommend our S500-39 spiral balance with a 17-012 bracket. See what you think.
39" Series 500 Spiral Balance
39" Series 500 Spiral Balance
S500-39
$11.77
Wire Charging Tool for Non-tilt Windows
Wire Charging Tool for Non-tilt Windows
75-004
$2.55
Bracket, #32
Bracket, #32
17-012
$1.20
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