Milgard single hung balancer

Thanks for posting! The marking from your balance is the stamp that indicates the weight range a balance should be able to support. Unfortunately, it cannot be used to identify the exact series you need, there are quite a few different configurations that shoe this stamp.

That said, I will need to see a photo of the existing balance removed from the window. I am looking to see photos of the top and bottom attachments from the balance as well as any that could possibly be left behind in the window.

Please don't hesitate to reach out with any questions you might have in the meantime.