Coil balance

A contractor from Hanahan, SC says:
Hi
I am trying to identify which coil balance will match the ones shown in the photo. The existing balances are 1/2" x 1 1/4" double coil. Sash weighs about 10 lbs.
let me know if you need more information.
thanks
Jack
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Bob from SWISCO responded:

Hi Jack. Your pivot shoe looks like our 15-180. This is compatible with our Series 190 Coil Balances. I'd confirm the exact weight of the sash to be safe, but if it weighs 10 lbs, you could use one of our S190-540 5 lb coil springs on each side of your sash, to equal 10 lbs of support.

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