Frans: Goede dag meneer. (that is all the Dutch I can remember) I suggest you send all the bass strigns to a bass string maker. I am sure there are some in Holland, or Germany. You can also call one of the string makers in the US, and just tell them the model and serial number of the piano, and they will have the scale of the piano you want. 2 companies that can help you. Mapes Piano Strings (615) 543-3195 Schaaf Piano 708-438-4556 Tot ziens Willem Blees RPT St. Louis
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