Balance stamp option

A home owner from Riverside, ca says:
May 12, 2017
I'm looking to get the S385-27 balance but not sure which stamp option to choose. I'm guessing 2630 or 2640 but not sure.
channel balance
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Tom from SWISCO responded:
May 16, 2017
If your stamp reads 26 4, then the 2640 option is usually what you want. You can always weigh your sash to be sure.
27" Series 385 Channel Balance
27" Series 385 Channel Balance
S385-27
$10.55
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