Yamaha mystery noise

[Ron Koval]

Dave,

Try to isolate by seeing if you can make the noise with the action out.  If 
not, check the back action, maybe a loose damper lead?  There was a cool set 
of damper sqeezing pliers advertised onlist a few months ago, they could 
come in handy. Also, check if you can make the noise with the damper pedal 
down.  Sometimes the upstop rail can even make some noises.   By your 
description of a rattle, (not just single click) did you try tipping the 
action on its side to see if anything is in there? (can you tell I work a 
lot in schools?)

Ron Koval
Chicago

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