Except for the impact noise of the key bottoming out on the keybed, I don't see how a hard front rail punching would have much effect upon the sound of the piano, assuming the key is not too limber, the piano is not getting the stuffings beaten out of it, and the action is properly regulated. I'm familiar with the difference in the feel of the thick soft front-rail punchings - vs - the hard ones. With much practicing, the hard punchings will make for sore fingers sooner. Also, there was an item about this very thing in the JOURNAL some 20 to 25 years ago. The complaint was impact noise, and the solution was to use the larger, thicker, softer punchings. We are assuming the key frame is properly bedded. I have not done any experiments or made any measurements of piano tone with FR punchings as the variable, and unless I do, I am going to refrain from making any declarations. The fact that the contact area of the sharps is less than that of the naturals has not come up in this discussion, but it has in some earlier ones. Jim Ellis
This PTG archive page provided courtesy of Moy Piano Service, LLC