Silver Line Channel Balance Spring Strength

A quick learner from Franklin says:
June 5, 2017
I have a silver line S765-21 which weighs 15 pounds. Which balance would be best to purchase,20-3 or 20-5? 15 lb sash. Thanks
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Tom from SWISCO responded:
June 7, 2017
Your best bet is to match it up to the original stamp. If you do not have an original stamp, then honestly either stamp could work with a 15 pound sash. I would double check the exact weight just to see if it leans more one way over the other.
21" Series 765 Balance
21" Series 765 Balance
S765-21
$13.33
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