Channel balance

A home owner from Boynton beach fl says:
May 21, 2022
Hello, I was about to buy one of the channel balance for my window but was unable to determine the window weight. My channel has a stamp "36-15 la5 cmc (36hp49-51)" . Also not 100% on the end links. Would you please help me out.
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Tom from SWISCO responded:
May 27, 2022

Thanks for your patience during this busy season. That is a very peculiar stamp. Before we go any further, can you tell me the exact weight of the sash? The stamps are just indicative of the calibration of the spring, so what I'm hoping is that if we can't get you a balance with this weird stamp, we can at least get you a balance with the same calibration. Thanks!
36" Series 385 Channel Balance
36" Series 385 Channel Balance
S385-36
$12.27
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