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#3062666 12/29/20 10:07 PM
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Duaner Offline OP
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I tuned a piano today that was flat as a pancake as they say but along with it all there were two keys side-by-side that the action of them was what I call "spongy". They did not react the same as the others. I tried several adjustments like let-off, back check, capstan adjustment, I wet lubed the jack pins and butt flange pins, I even took the keys out and dry-lubed everything and wanted to see maybe something had fallen down under the keys but nothing I did made them respond like I wanted them too although they did feel a tad better but it was obvious to me that they still were "spongy" feeling.

Any ideas for the next time I visit?


Duane Graves


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Duane,

A little hard to relate to "spongy" without seeing/hearing it, however my initial gut reaction was that the keys are broken (literally), except I would THINK you would have noticed it in your removal of them if that were the case. I have had a case or two over the decades where it took me a while to figure it out (not plain as day IOW).

Same sort of thing can be true of a hammershank (but two together is odd, but not impossible). Loose hammerhead? Split but not broken flange also...?

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Broken keys is what I would look for. There may not be any sign of it except if you bend them slightly so that the crack widens and becomes visible.

Other possibilities might be broken jacks, or a loose or cracked let-off rail.


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Peter and BDB's thoughts were mine also. Probably something cracked and flexing at the crack, rather than actually broken? On a very old Collard and Collard grand there was a note whose response might have been called 'spongey' - just didn't feel right at all. All seemed fine in the action on initial visual inspection. But the jack had a loose joint at it's heel, and was flexing when played.

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With these kinds of mysteries, it is best to test the action components separately - hold down the back of the key and gently push on the front - does it feel solid? Ok, the key is solid... Then move your way up to find the source of flex.

Divide and conquer!!

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