Window sash won't close after replacing the window balances

A quick learner from California says:
I just purchased your series 395 balance (4). See order number 715249. Now, when I try to close my window, it won't close all the way. It stops about 2" or 3" short. What's wrong?
Profile picture of Paul
Paul from SWISCO responded:
It sounds like you may not have the correct length. I see you ordered the 24" Series 395 balance. What is the length of your old balance's metal channel?
A home owner from California says:
It''s 24" . The number show on the bar say 2430. I sent Steve picture.
Profile picture of Paul
Paul from SWISCO responded:
I think that's the problem. The number on the metal channel is not a direct match to the actual length. In fact, with a stamp of 2430, the length of the metal channel should be 25". I know that may seem confusing, but keep in mind the stamp has more to do with the strength of the balance than its actual size. When determining the size, it is important that you measure it to confirm exactly what length you need.
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)