Examples from the Web for tuning key
But Czipra began to put the strings of the czimbalom out of tune with her tuning-key.Debts of Honor|Maurus Jkai
They had strings of brass wire which were tuned by a key, not very different from the present tuning-key.The Story of Ancient Irish Civilization|P. W. Joyce
"That I could help," said Arnold, as he took his tuning-key out of his pocket.