I have been having a problem with one of the keys, C6, on my Yamaha baby grand piano. The note sometmes sounds and sometimes doesn't. If I play the note repeatedly, quickly, it sometimes stops sounding. If I give it a rest and then play it, it usually sounds again. When it stops sounding, the hammer is not propelled as far as the string. I took the action out to inspect it and to compare it with the action of the surrounding keys. It seems that when the note is played, the tip of the jack doesn't protrude through the slot in the repetition lever as much as for the other keys. I guess the tip of the jack has to stick through the slot a certain amount to engage the hammer knuckle, in order to thrust the hammer towards the string, and it is just on the point of not being far through enough. Please could you suggest what the solution might be? If I turn the Letoff regulating screw so that the letoff button is lower, I think it might cause the tip of the jack to stick through the slot in the repetition a a little further because the jack toe will engage the letoff button punching across a shorter distance than before, making it more certain that the note will sound. Would this be the correct thing to adjust or is there another alternative? (I didn't examine the knuckle to see if it is worn or if there is a deep groove in it. It seemed to be OK) Thank you very much for your help. Robert Finley
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