SWISCO - The Replacement Hardware Authority

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.
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Tom from SWISCO responded:
A stamp of 25 5 usually corresponds to our 2550 option, but you can always weigh your sash to confirm.
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