window sash springs

A contractor from Kerrville, TX says:
July 7, 2016
the spring measures 3/8

don't know what series to order

it is 30" long
User submitted image of their window hardware.
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Tom from SWISCO responded:
July 11, 2016
Thanks for posting! For these old wood sash balances, we like to recommend our Series 500 spiral balance, along with a bracket like our 17-012 . I believe this should work for you.
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Bracket, #32
17-012
$1.12
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Spiral Balance Charging Tool for Non-tilt Windows
75-005
$9.37
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30" Series 500 Spiral Balance
S500-30
$9.72
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#8 x 1" SS Philips Pan Head Screw
33-017
$0.21
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#8 x 3/4" Philips Pan Head SS Screw
33-090
$0.27
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