Balance springs

A quick learner from California says:
2140 BSI DW? 23 inch?
Thumbnail of the uploaded file named Sash lock
Thumbnail of the uploaded file named Stamp code
Thumbnail of the uploaded file named Channel 2
Thumbnail of the uploaded file named Channel length
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Casey from SWISCO responded:

Hello,

Your channel balance resembles the S395-22, which should have a 22" metal channel not including the end fittings. Your stamp code would correspond to 2140 strength options for these balances which will support a sash between 15-23 lbs. Take a look and thanks for posting! 

Close up view of the S395 balance top.
Close up view of the S395 balance top.

Close up view of the S395 balance shoe.
Close up view of the S395 balance shoe.

A quick learner from California says:
Perfect. Window sash is 19.2 lbs and metal length is 22 inches. This was also my conclusion. Thanks for the help!
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Casey from SWISCO responded:

Great, then you should be good to go! Just let us know if you need anything else. 

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