how to determine the weight

A quick learner from patterson, ca says:

My broken balance has the stamp as "86 26-4 B5 CMC 1145" on it. I measure the balance which is half inch with 26 inches. I could not figure out what weight option I should choose.

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Tom from SWISCO responded:
Can you confirm the length of your metal channel? Based on your stamp, it should be 27". As for what option to choose, we usually recommend the 2640 for a stamp of "26-4," but you can always weigh your sash to confirm.
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