Same stamp for balance pair?

A handy person from FL says:
April 4, 2012
I have a 12" balance on each side supporting a window sash with a weight of 6.4 lbs.

On another set of windows I have a 24" balance on on each side supporting a window sash with a weight of 16.9 lbs. These balances do have a stamp, although one side says 2320, the other side 2330. Shouldn't the balances be the same for both sides?

If you could please direct toward me towards the correct balances for the window sash weights for the 12" and 24" balance in the 351 series, I'd really appreciate it.

Thank you
Profile picture of Paul
Paul from SWISCO responded:
April 9, 2012
You are correct, the pair of balances should have the same weight spring. Going by your sash weights, for your S351-12 the stamp option should be 1120, and for the Series 351-24 the stamp option should be 2330.
24" Series 351 Channel Balance
24" Series 351 Channel Balance
S351-24
$10.77
12" Series 351 Channel Balance
12" Series 351 Channel Balance
S351-12
$9.34
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.