can not find any info on the existing hardware

A home owner from Camden says:
Please help me to identify the part catalog number I need to order. Thank you!
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
The pivot shoe looks okay, but the coil spring is broken. It's our Series 150, so look for a letter or number stamped on it. The number corresponds to the weight that the coil carries, so you'll want to choose the same number as your old coil when you go to order.
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)
Current wait time is 4-7 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at 856-317-6263 or at