Series 152 Coil Balance Markings

A home owner from Phoenix, AZ says:

I have style 152 coil balances (1/2" wide with tapered ends) in my windows. For a particular window where the springs have broken, the two springs are marked "D L" and "C". Could you tell me what weights these springs are?
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Paul from SWISCO responded:
I'm not sure. These kind of springs don't usually have letters stamped on them. The C might be our S152-3 and the DL might be our S152-4, but that's just a guess. I recommend weighing your sash. If I know the sash weight and how many coil springs are used in the window, I could recommend the appropriate part.
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