On a well-used 10 year old C7, the right string(only) on most of the high treble notes does not sound (just a thud). String sounds good when plucked. Thought it was hammer alignment, but even with the una-corda depressed, there was not much of a difference. Filed a few hammers flat across the top, but no improvement. Then noticed a indentation sideways on the strikepoint of most of the affected hammers. The felt seems to sink in (soft) at the strikepoint, too deep to file off. I doped the hammers with some keytop solution and the sound of that string got better; but this is only a temporary solution. As I see this piano every ten days, I know I'm going to face this problem again very soon. Has anyone a suggestions on these Yamaha hammers? Phil Ryan Miami Beach
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