Assistance identify window balance

Quick Learner from Denver, Co
Hi, 
I need some assistance replacing the correct window balance for my window. The widith is 1/2 inch thick. The length is 28 inches, There is a number on the current balance of 2740. This window only operates up and down. Thank you! 
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6 Replies
Bob
Bob from SWISCO
SWISCO
Expert

Hello there. I am confident we can help, but we need to see clear photos of the nylon attachments on both ends of the metal channel. It's best to remove the balance and send us photos of the attachments so they're as clear as possible. We should be able to narrow this down from there.

Quick Learner from Denver, Co
Thank you for replying. I've attached more photos. My current window balance works, the problem I'm having, the window doesn't sit correct. The right side has a gap leaking air. I'm in hope of replacing these balances, that'll fix the issue. 
5 user uploaded images
Bob
Bob from SWISCO
SWISCO
Expert

Thanks for getting back to us. It looks like this is either an S351-28 or S390-28 Channel Balance. The only difference between these two balances is the 'depth' of the bottom nylon shoe, or the 'heel-to-toe' measurement. See the diagram below. Measure your old balance's shoe to see what matches best. For a stamp option choose 2740.

Comparison of the S351 and S390 balance shoes.
Comparison of the S351 and S390 balance shoes.

Quick Learner from Denver, Co
Thank you so much, for taking the time to assist. I grateful appreciate you. I will measure the shoe. I hope you have a great day. 
Bob
Bob from SWISCO
SWISCO
Expert

Sounds good, and thanks for the kind words! Let us know if you need anything else.

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