Constant force balance

A home owner from USA says:
The bottom shoe is broken and springs are no longer attached. 15 is stamped on it. Do you have something that will work?
Thx!
Wayne
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Paul from SWISCO responded:

Hello Wayne. We'd like for you to take a look at our S140-5 quick-tilt coil balance system. We feel this could work for you. There is also the possibility of maybe having to replace your pivot bars. We offer two types that go with this system, our 26-398 and 26-405. Compare the screw holes of your pivot bar with ours to see if any of these match up. 

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