Balance replacement

A quick learner from Mountain view says:
July 22, 2017
Hi

I need a couple window balances.

There are no markings other than 4 raised bumps.

I measured 36" and it looks like 5/8" wide

Thanks
User submitted photos of a window balance.
Profile picture of Tom
Tom from SWISCO responded:
July 26, 2017
Hello and thank you choosing SWISCO.com. It looks like you could need the S350-36. If there are no markings on your balance, you will need to weigh your sash on a scale to confirm the best option.
A quick learner from Mountain view says:
July 31, 2017
Hi Tom,

somehow I had a second post that seems to have gotten lost.

I have a balance that's marked "27-4-FF Caldwell".

The metal part measured 28" and the sash weighs 21 lbs.

Any recommendations for a replacement?

Thanks,
Josh

Profile picture of Tom
Tom from SWISCO responded:
August 3, 2017
I'm not sure. The stamp doesn't tell me what Series you have, that's only indicative of the spring strength calibration. The only way to match up the Series is by comparing the nylon caps on either end to those replacement parts we offer on our site. You can see our entire selection here.
36" Series 350 Channel Balance
36" Series 350 Channel Balance
S350-36
$12.27
How to Replace a Non-Tilt Channel Balance
How to Replace a Non-Tilt Channel Balance
VIDEO
WATCH >
How to Repair a Jammed Window
How to Repair a Jammed Window
VIDEO
WATCH >
How to Identify Replacement Channel Balances
How to Identify Replacement Channel Balances
VIDEO
WATCH >
How to replace a non-tilt channel balance
How to replace a non-tilt channel balance
GUIDE
READ >
Choosing a Non-tilt Channel Balance: What Will We Need?
Choosing a Non-tilt Channel Balance: What Will We Need?
GUIDE
READ >
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 3-4 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 (888) 991-1929 or at help@swisco.com.