STAMP ON CHANNEL BALANCE

I'm not sure how we would determine if the Series 770 was what your window used originally. The only way to know that would be to try and find the original installers, whoever they may be.

As for the balances you have now, I can tell right away that the reason why the new S770-12 cannot hold up your sash is because the spring is not the same strength. If you can, please weigh your sash on a scale so that we can know for sure which of our options can work for you.

Can you also give me more information about how it attaches? How does it differ from the Series 770 exactly? Could you show us pictures?

The stamp only tells us how strong the spring is, though to tell the truth I'm not familiar with "12KL" either. I am assuming you have a S770-12 because this is the product you were posting under. I agree that it looks similar, so I didn't have any reason to think otherwise. Do you believe you have a different Series?

While some companies may sell the same hardware, not everything will be the same. Some balance types have been known to be produced by different manufacturers, as well. It can be a little chaotic, which is why we like to rely on hard information like pictures, measurements, and sash weights. Manufacturing codes may be unreliable, but measurements never lie.

Right now, it'd probably be best to get us the following information:

1) The weight of your sash, which can be determined by removing it from the window and placing it on a scale.

2) A picture of how your balance attaches to the window. The S770-12 attaches with a screw, but I am not sure how yours attaches.

3) A picture of the shoe that the metal clip hooks onto. That will let us confirm that the S770-12 hook will work the same way.

Thanks for the additional pictures. Sometimes, window companies order standard balances and make slight changes to accommodate their windows. Based on what I see here, we can make this balance for you, but it will have to be custom made. I believe it will be a standard S770-12 tilt balance, but with a top rivet instead of the white screw plug at the top.

Before we begin, though, we will just need to know the weight of your sash and exactly how many of these balances you will need. The main problem seems to be that the windows sag, so getting the weight of your sash is essential in making sure the new springs are strong enough.

Thank you for the additional information. That should be everything we need. I just need two last bits: are these balances for the top or bottom sash, and how many would you like?

Great, thanks. I've emailed you a custom order link and quote, which you should receive in a moment. We also sell the S-hook separately; you can view them on the right side of this page.