Israel, I have run into this problem on some college piano faculty teaching instruments where the teacher was playing examples for the student in the extreme high treble. While doing so they were pounding away hard enough to be heard over the piano major playing throughout the rest of the range of the piano. Of course metal fatigue sets in fairly quickly and requires restringing the high treble although the same problem did not arise on the concert instruments. (The one that immediately comes to mind is a Yamaha C7 in the studio, while the Baldwin F and Steinway D in the concert hall had no problems.) So try to check the pianist's habits and see if there is any particular habit that is contributing to the string's early demise. This may help in the diagnostic process. Allan Gilreath Gilreath Piano & Organ Co. Berry College Gilreath@aol.com "In the olden days we did not expect pianos to remain really well in tune..." - Samuel Wolfenden - 1927
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