Sash Stamp Weight Range Unknown???

A quick learner from Florida says:
I am purchasing 2 "380" window channel tracks. I do not know which Stamp Option (Sash Weight Range) to indicate. There is nothing marked anywhere on the windows, sashes or channel tracks. How do I know which Stamp Option to order according to the options that are listed below?

Stamp Option / Sash Weight Range
2910 7 to 12 lb
2920 12 to 16 lb
2930 16 to 23 lb
2940 23 to 28 lb
2950 28 to 32 lb
2960 32 to 35 lb
2965 35 to 39 lb
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Paul from SWISCO responded:
If there is no stamps already on your balances, then you will need to weigh the sash in question by removing it from the window and placing it on a scale. You can then match that weight up to that chart.
A quick learner from Florida says:
By "Sash", do you mean the window that slides up and down?
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Tom from SWISCO responded:
Yes, that is correct.
A quick learner from Florida says:
Okay, thank you.
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