Ander Son Sash Balance No Stamp?

A contractor from Trevose Pa says:
I have Ander Son Sash Ballance number on unit is 11600-17.

I can not match the numbers on your sign.

I need to puchase one full unit.

Do you sell replacement strings?

Please let me know.

I may purchase all four (4) new
Profile picture of Tom
Tom from SWISCO responded:
Thank you for posting! Unfortunately, I am unable to identify what Andersen sash balance you need based on this information. There should be another stamp somewhere on the balance--make sure to check the tabs, and even on the underside. If you aren't sure which stamp is the right one, please submit a few pictures of each of your stamps for us to look at and identify!

We do not sell replacement strings for these balances.
A quick learner from Trevose Pa says:
The only other number is

C20 6#31 6-85

This number does not match anything on your site

The only other information on the balance is the anderson logo
Profile picture of Tom
Tom from SWISCO responded:
Ah, there it is! That's the number we're looking for. Please take a look at our 24-637 Andersen Sash Balance. This can be used to replace balance boxes with the stamp 6#31.
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)