need new channel balancers

Hey, thanks for posting. I've narrowed this down to two possible channel balance Series: either our Series 351 or our Series 390 balances.

Now, as you can see, there is only one difference between these two Series, and that is their bottom shoe. The Series 351 uses the 15-002 while the Series 390 uses the 15-001. I can't quite tell what you have based on your pictures, though. Please carefully compare their dimensions to your own hardware and see which is a better match. Can you also confirm the weight of the sash that goes to each balance? That will help us confirm the best weight options.

There probably isn't a marking that tells you the weight. The easiest way to get your sash weight is to remove it from the window and place it on a scale. Any common bathroom scale should do. Check out the video below to see how you can remove the sash.

Thank you. Looks like your sashes are heavier than is typical. One of the needed balances will have to be custom made. Before we get started, I would just like you to confirm that the length of the metal channels for each balance are 27" long (26DS) and 18" long (17DS), respectively.

If so, then I think I can help you out. The first balance would be for a S390-27 with a 2665 option. Two balances with this option can carry a window sash weight of 33 through 36 pounds.

The second needed balance, S390-18, would need to be custom made with a 1760 option. Two balances with this option can hold 20 through 23 pounds. You should confirm that this sash is either 23 pounds exactly, or a little below, because if it's over then the 1760 option may not be best.

If this information looks good to you, I can email you an order link and price quote.

If you think any of this information is incorrect, or if you think anything should be changed, let me know and we can work from there.