Identifying old spiral balances

A quick learner from Hinsdale says:
September 26, 2017
These is the length is pictured. The width is between 3/8 and 5/8 but 5/8 should fit just fine.

Also need brackets for bottom of window as well as adjustment tool. Please advise what length as I should get here as its between 26 and 27"?
spiral balance
Profile picture of Tom
Tom from SWISCO responded:
October 2, 2017
Hey there! This is an old spiral balance that is no longer made. We recommend our Series 500 and a bracket like our 17-012. We've used this setup to replace balances on wood windows like this for decades. For the length of the balance, go with 27" (S500-27). Let us know how you make out.
Bracket, #32
Bracket, #32
17-012
$1.20
Wire Charging Tool for Non-tilt Windows
Wire Charging Tool for Non-tilt Windows
75-004
$2.55
#8 x 3/4" Philips Pan Head SS Screw
#8 x 3/4" Philips Pan Head SS Screw
33-090
$0.27
#8 x 1" SS Philips Pan Head Screw
#8 x 1" SS Philips Pan Head Screw
33-017
$0.21
27" Series 500 Spiral Balance
27" Series 500 Spiral Balance
S500-27
$9.42
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