Series 770 Balance

A contractor from Central Florida says:
Good Day,

I'm trying to replace a S770 balance and I'm confused. The overall meas. is 28", but there's a stamp of 27b on it ? Your help is appreciated.

James DeMichael
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Donna from SWISCO responded:
Yes, if it is a Series 770 with a channel length of 28" the stamp will normally start with 28. Please reply with detailed photos of the current balance, perhaps you have a different balance series.
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