Replacement balance spring for single hung window

A handy person from Sandy, Oregon says:
May 3, 2021
I believe it is a Starline window. The spring is broken. The balance spring assembly is labeled 17E.The metal channel is 18" long, 9/16" wide and 5/8" deep. The window sash weighs 19 pounds. Thanks, Erwin Schroeder
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Bob from SWISCO responded:
May 4, 2021

See our S350-18. Carefully review the specifications and see if this channel balance matches what you need. For a new stamp option, 17E might conform to our stamp of 1750, which designates a balance that can support a window sash in the weight range of 17 through 20 pounds. If you're uncertain, weigh the sash to confirm. 
18" Series 350 Channel Balance
18" Series 350 Channel Balance
S350-18
$9.34
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