If a piano is -180c, there is another, yet unmentioned, possibility. The piano may not be able to hold a tune. You can usually gauge this by feel or by investing in a tuning pin torque wrench to quantify matters. -180c Raises red flags for me. I will always tell the customer that the tuning stability is dubious and explain the concept behind how tuning pins are mounted, etc. and that we can tune now and observe to see what happens. Matt W.
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