SWISCO - The Replacement Hardware Authority

What is a stamp option

A quick learner says:
What is the significance of the stamp option for the 31" Series 371 Channel Balance and how do I figure out my sash weight range?
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Tom from SWISCO responded:
The stamp option represents the strength of the channel balance. Finding out which option is best for you is an essential step when replacing your balance hardware. Locate the stamp on your channel balance to determine which of our options to choose. If you still don't know what you need, weigh your sash and compare that weight to the chart we have listed under the S371-31.
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