Assistance identify window balance

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!



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.




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.





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