What's the angle on angles?

[Alan Barnard]

I just replaced a set of backcheck heads on a (Samick-built, I think) Hyundai grand.

Historically, I've set the heads at the angle wherein the back of the heads are parallel with the wire.

But what about these pianos with the rather short, intentionally curved backcheck wires? What's the angle on setting these angles?
 
Alan Barnard
Salem, MO
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