<< While the client asked to the seller to fix this problem with the guarantee, I was just curious to know how such a problem can be solved? (remove the offending pins, clean the hole with a pinhole brush and repining with two sizes larger pins?) Would these pins stay jumpy after repinning? >> Greetings, Be very careful about up-sizing these pins. Measure them first and perhaps go to the next size over. I have seen problems when using oversize pins in Yamaha's, and it generally because too large a pin was installed and you have a creaky pin to live with. Regards, Ed Foote RPT http://www.uk-piano.org/edfoote/index.html www.uk-piano.org/edfoote/well_tempered_piano.html
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