Spiral balance from the 70's

A quick learner from New Jersey says:
Can you please help identify the attachment for a spiral balance as pictured below.
The balance itself is 5/8 x 31" long, from an aluminium non-tilt window from the 70s. Unfortunately i couldn't identify the manufacturer.
User submitted photos of a window balance.
Profile picture of Paul
Paul from SWISCO responded:
The company that made your balance has gone out of business, but I think we can still help. I will just need some additional information. First, what is the color of the outer tube that originally covered the spring? Also, what is the weight of the sash? Is the 31" the length of the balance tube only? Finally, please provide dimensions for the metal sash carrier in your photos.
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)