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A quick learner says:
May 4, 2020

Hello.

I need two balance springs for a Lawson window. The sash dimensions are 51? wide x 31? tall and weighs 56 lbs.

Thanks,

Norm

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A handy person says:
May 4, 2020
The channel length is 30" and is 1/2" wide.

I ordered one in the past for a smaller window and it was a series 385 channel balance.
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Tom from SWISCO responded:
May 7, 2020

Hey, Norm. There is a chance that this balance is our Series 385 as well, but I cannot confirm from these pictures. You will need to compare the size of your top and bottom nylon fittings to the two that come with the Series 385, the 19-005 and 15-004. If they match, then it should work fine.
30" Series 385 Channel Balance
30" Series 385 Channel Balance
S385-30
$11.30
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