single hung balancer replacement

A quick learner says:
Please identify these pictures for replacement of single hung balancer. Window manufacture name was summit windows in St. of WA. No longer exist.
Thank you.
User submitted photo of channel balance.
Profile picture of Donna
Donna from SWISCO responded:
Thanks for posting your photos.

It appears the S385-21 will work as a replacement. Stamp option 2030 will carry a sash weight range of approximately 12 to 15 lbs.
A quick learner from Seattle, WA says:
Hi, S385-21's plastic parts were fine, but balancer it self didn't work. Please take a look at the picture showing what is existing shape of metal cross section part compare to S385-21. S385-21 widens and sides of balancer touches vinyl frame of windows. I hope you have something it would work.
Thank you.
A customer submitted illustration comparing two balance series.
Profile picture of Paul
Paul from SWISCO responded:
I'm sorry that you've had trouble with this balance replacement. This is the first time I've come across someone having a problem replacing their rib balance with our channel balance style.

I compared both balances and the measurements matched up at 9/16".
A quick learner from Seattle says:
Is your balancer S385-21 is the only replacement you could recommend?
Existing one has a lip at the opening of body of balancer that measures 5/8" from the edge of lip to the other, however the opposite side has 9/16" in measurement. Are you saying your S385-21 measures 9/16" at both (opening of body & the other side -- they are both long side)?
Thank you.
Profile picture of Mike
Mike from SWISCO responded:
We strongly believe that the S385-21 is the best replacement for your balance. As we said, there has never been a problem with this before. If you still have trouble with it, I recommend that you consult with a local professional and see if they can help you with the physical installation.
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