If you are looking for information on this topic, it is typically found in specialized piano technician forums or groups, such as the Piano Tuning and Repair Discussion Group [31].
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In piano restoration, particularly for high-end instruments like a Bösendorfer, technicians may address clicking or mechanical noises in the "action" (the internal mechanism) by massaging into the leather or felt components [31]. This reduces friction and smooths the movement of the hammers without compromising their ability to "catch" properly [31]. If you are looking for information on this
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