Replacing Window Balances

A quick learner from Venice Florida says:
December 27, 2018
1-marked 2940 bsi vk measures 1/2"wide 31"long and a 1" base plate
1-marked 2840 bsi ax measures 1/2"wide 30" long and a 1" base plate
I believe someone replaced the balance with the wrong size (2840)
The window measures 51" x 61" inside the house
A quick learner from Venice Florida says:
December 27, 2018
The numbers and measurements are in the previous post.although these came out of the same window they are different numbers and lengths,the longer balance is marked 2940 the shorter is 2840. I am not sure which is the proper balance.
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Bob from SWISCO responded:
December 31, 2018

With this combination of end attachments, you could have either a S380 or S385 channel balance. Both balances are available in the 30" and 31" lengths that you need. You need to measure the bottom attachments as shown below. The Series 380 has a 1" bottom attachment, and the Series 385 has a 1-3/32" attachment. The stamp numbers you gave us correlates with the spring strength option that you'll choose on the product page. 

Thank you and let us know if you have any other questions or concerns.


Comparison of 15-004 and 15-005
Comparison of 15-004 and 15-005
30" Series 380 Channel Balance
30" Series 380 Channel Balance
S380-30
$11.30
31" Series 380 Channel Balance
31" Series 380 Channel Balance
S380-31
$11.30
30" Series 385 Channel Balance
30" Series 385 Channel Balance
S385-30
$11.30
31" Series 385 Channel Balance
31" Series 385 Channel Balance
S385-31
$11.30
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