Andersen Window Balance replacement

A handy person from Baltimore, MD says:
the number on the old balance is: C39 6#23 3-78

The patent number is 11600-3

The unit is 3" x 6.25" plus .5" flange
Profile picture of Paul
Paul from SWISCO responded:
24-637. Thanks for posting. Based on your stamp, I recommend our 24-637 Andersen sash balance.
A quick learner from Baltimore says:
Thanks for your reply. Can this replacement unit be used on both the right and left sides of the window?
Profile picture of Tom
Tom from SWISCO responded:
Yes, the 23-637 can be used on both the left and right side.
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)