Caldwell Channel Balance stamped 25 5 GP

A home owner says:
I have determined that the channel balance is a Series 385 in 26" length. The channel has 25 5 GP on the side. I don't know how to pick a spring weight from the numbers on the channel. David.
Profile picture of Tom
Tom from SWISCO responded:
A stamp of 25 5 usually corresponds to our 2550 option, but you can always weigh your sash to confirm.
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)