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Joined: Oct 2020
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I have encountered an odd situation in regulating a 1908 Steinway O. All felt has been replaced, new WNG CF whippens and hammer shanks with new hammers and everything is to specs. When adjusting the let-off, I find that for all of the black keys I can feel the jack moving out from under the hammer knuckle, but for the white keys I cannot. This is puzzling that it is not random, thus pointing to a mis-adjustment elsewhere, but specifically related to white and black keys. I usually adjust let-off by setting up my let-off rack at the appropriate height, blocking the hammer to it and screw-down the let-off screw until it lets off, using the touch weight I like. This only works on the black keys. The white keys do not let off. I can see the jack tripping out from under the repetition lever, but the hammer does not check and I cannot feel the let-off on the whites. The jacks are all adjusted the same, so it is really puzzling. Any clues?

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I would look at the drop screws


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Actually, I found the problem. I had set the key dip to 9.5mm (3/8"), but it really needs to be 10.6mm. I found that one of the sharps did not check as well as the others and it had just a little less key dip than the others. Then I removed a .04mm front rail punching from one of the white keys and it fixed my problem. I must have set all of the sharps with more dip than the white keys so that is why they had let-off. Thanks for your help. Not the fix I was hoping for...one of the challenges with the Steinway's variations.

Last edited by Scratchman2; 05/14/22 05:47 PM.
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That’s great you find the problem source within 2 hours! Hope no other problems pop up.

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I was going to suggest checking keydip. Naturals and sharps rarely have the same dip.


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Not only that, there are several different ways of measuring key dip.


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