A contractor from Glen Mills PA says:

I'm trying to repair an old Andersen window where the sash balancer has failed.

I've removed the balancers.

It appears to me the part numbers are 11600-17.
The windows is double hung.
I figure it's about 25 years old.

I also see a number stamped on the balancers:

K4 8#27 7-87

I need the left and right balancers.

Profile picture of Paul
Paul from SWISCO responded:

Thanks for posting, Mike. Our 24-837 Andersen sash balance box should work in place of yours with the stamping of "8#27". 

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 (888) 991-1929 or at