Windows Not Staying Up

A home owner from Barnegat, NJ says:
October 24, 2020

Hi...It looks like the first picture has 3000 imprinted on it and the 3rd picture has 2800 imprinted on it. Could you please tell me if the part code S770-28 is the correct item to order and if so what would be correct part option.

Thank You,

Rob 

Thumbnail of the uploaded file named image.jpg
Thumbnail of the uploaded file named image.jpg
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Casey from SWISCO responded:
October 28, 2020

Hello,

We'd be happy to help but to get started, we'd need to see an entire, undamaged balance removed from the window to confirm the correct series. Also, I would recommend weighing your window sash to determine the spring strength since you 2800 stamp is different than what we would normally see on this kind of block and tackle balance. Thank you!
A home owner from Barnegat, NJ says:
October 28, 2020
This picture is the best I can get...I hope this helps. Thanks in advance for your time.
Thumbnail of the uploaded file named image.jpg
Profile picture of Casey
Casey from SWISCO responded:
October 29, 2020

Perfect, I agree that your balance looks like a match to our S770 but you'll still need to weigh the sash and follow the chart under the product description to choose the correct strength option. Thanks for posting! 
28" Series 770 Balance
28" Series 770 Balance
S770-28
$12.70
How to replace a tilt-window channel balance.
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