My "F" springs are broken

A quick learner from OH says:
June 10, 2018
My broken constant force balance springs are stamped "F". They are 1/2 wide with just a single mounting hole on the end. What spring would I need?
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Casey from SWISCO responded:
June 12, 2018

Hi there, thanks for posting. We're happy to help find the correct balances for your window, but we'll need a little more information still. If you can send us some photos of the balance removed from the window, we should be able to take it from there. We will need to see the full channel, and the top and bottom attachments. Thanks!
A quick learner from OH says:
June 13, 2018
Hello,
Attached please find the photo of the broken spring by itself.
I am away from the house now and cannot send you pictures of the other components.
Hopefully, this is sufficient for you to tell me what replacement springs I would need.
This one is stamped "F"

Thank you.
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Paul from SWISCO responded:
June 15, 2018

Thank you for sending this photo to confirm your 1/2" coil spring. You will need the S152-7 coil. The letter "F" represents the #7. It's just a new system.
7 lb Series 152 Coil Balance
7 lb Series 152 Coil Balance
S152-7
$4.80
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