Balance strength option

A quick learner from Seattle says:
Recently ordered a pair of S385-21, option 2010. Turns out to be too weak to hold the window up. There was a code on the old balance which appeared to say "2010" so I thought that was the correct option to order. Foolishly I never weighed the sash until now, and it weights 20 lbs, suggesting the "2040" option. My question: is ordering by sash weight the foolproof way to determine the option?
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Paul from SWISCO responded:
Hello, Stuart. Yes, weighing your sash is the only way to confirm what option is correct.
A quick learner says:
Thanks, Paul
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