Silver Line Channel Balance Spring Strength

Question

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

Tom · Accepted Answer

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.