Replacement Balancer for an Alcan window

A handy person from Orlando, FL says:
May 21, 2012
Alcan window installed 1991. Window goes up BUT doesn't stay up. Pics enclosed. Original balancer 18" long.
1/2" wide.
A customer submitted photo of channel balance attachments.
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Paul from SWISCO responded:
May 22, 2012
Thanks for posting! Based on your images, it looks like you may have something similar to our S380-18. Do you think that would work for you? If you'd like us to help you identify what option you need, as well, please let me know what the stamp printed on your channel reads.
18" Series 380 Channel Balance
18" Series 380 Channel Balance
S380-18
$9.34
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