2220 weight designation ?

2220 is the weight designation. I can't tell what balance you have, though, because it depends on what the top attachment looks like.

It's easier to identify the bottom shoe when I can see the top shoe, but start by seeing if you have the 1-1/8" 15-001, shown below:

Oh, I see what you mean. The top attachment in your photo appears to be totally sliced off. That explains why I missed it. Do you have another balance from the same window, or a same-size window somewhere else in the building? You'll need to take a look at that attachment in an unbroken state.

As for the shoe, there are two options: 1" flat, or 1-1/8". If it's more than 1", it likely wore down from 1-1/8" (Series 390). If it's 1", it's Series 351.

Comparison of 15-001 & 15-002

Ah, is the top attachment broken in your photos? The Series 372 top attachment has wide flaps that should stick out to the sides, but I can't see those. Maybe they fell off. Can I see a photo of an unbroken top guide, up close? Or at least, can you confirm that the unbroken attachments used to have flaps? If so, direct your attention to S370-23, which may have the same top and bottom attachment that you need.

I'm sorry to hear you're having trouble with this balance. Could our 19-011 top fitting be a better option? Look that over and see what you think.

If so, you have two courses of action. The first is that we can specially make this balance for you. You can return the S370 you purchased for a refund and then you can place a special order for this special balance.

The other course of action would be to swap out the top attachment yourself. It's not too difficult, but it does require some special tools. See the video below for instructions for this project and let me know how you wish to proceed.