How to determine sash weight for S900-29

A handy person from Sarasota FL says:
No color tips anywhere. Standard contractor grade windows.
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Tom from SWISCO responded:

Hello! It looks like you have tilt window spiral balances. Without a color tip, your only option is to remove the sash from the frame and place it on a scale. Then, look at the chart we show on the S900-29 store page. That tells you how much weight each color tip option supports.

A handy person from Sarasota FL says:
Well that's easy, but is that all there is to it? What about friction and the like?
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Tom from SWISCO responded:

Yep! Friction is accounted for. The only thing that I can see causing a problem is if maybe you changed to a ticker weatherstripping at any point in the past, but that doesn't really have anything to do with the balances.

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