<html> <head> <meta http-equiv="content-type" content="text/html; charset=ISO-8859-1"> </head> <body text="#000000" bgcolor="#FFFFFF"> Why were certain notes on my customer's nice old German upright going "dunk"?  Because the damper felts had come off the heads and stuck to the strings. This action has a set of "fly dampers" in the bass - not unusual - BUT, in this action, they are below the level of the hammers. See pic.  I've not seen this before. Best regards, David. </body> </html>