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The fix recommended by Yamaha involves shimming the balance rail (not the hammer rest rail). This will slightly change/increase the angle of the keys, which will address the interaction with the wippen ...

Back to the topic... I have found that working with alternate temperaments also changed how I listened to the piano. Similar to the way my listening changed after first learning to tune. I began experimenting ...

I'm going to support Yamaha's recommendation. Shimming the rest rail a bit is necessary to compensate for unwanted increased blow distance due to the rest rail felt compacting as the piano ages. This is ...