Coil balance Stamped 10

A handy person from lemon Grove Calif says:
I need to replace the Dual coil quick tilt balance. The old one has the number 10 stamp on it. It has two spring and is 4 3/4 long 1 1/4 wide & 9/16 thick. What I can fine so far is only one spring. Don't have a picture as the old broke when I took it our of window.
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Tom from SWISCO responded:

Thanks for reaching out to us. When you said the old balance had the number 10 stamped on it, do you mean the 10 was stamped on just the housing itself or was it printed on each individual spring?

If the 10 was just on the housing then you should be fine using our S140-10. Each assembly is rated to hold 10 pounds, same as your original. It doesn't matter if it has one spring, two springs, or more, 10 pounds is 10 pounds. 

One way you can check to be 100% sure that this is right is to weigh your sash on a scale. Two S140-10 balance assemblies are meant to hold a total of 19 to 20.99 pounds altogether, so if your sash weight falls in that range then you should be good to go.

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