Do I need a custom balance?

Thanks for posting. We may be able to custom make this balance for you with this special clip attached. Before we continue, can you confirm the length of the inside spiral for each balance you need? In this case we don't need the tube length, but the spiral rod that goes inside of it. The length will be important to determine what will work. We will also need to know the weight of each sash, and how many of each balance you need.