Uh...by using assist springs. Seems fairly clear. David Love davidlovepianos at comcast.net www.davidlovepianos.com Greetings. On assist springs, I think they can make a bad action better by allowing the removal of excess key lead, not the right way to fix things. But, fooling around with these things I was able to 'feel' the same action with different amounts of key lead, . An old 550 Kawai had a nice action until I unhooked the assist springs and added lead. Fenton Curious as to how you got "an action with the same hammers, ratio, and BW, but different leading". If you change the leading, then you change the BW. That is to say unless you changed the leading but kept the FW constant. This said. Several of these posts seem to skirt the main issue involved here, namely that if your hammer strike weight is too high for your ratio, then the action is simply going to feel heavy in some sense or another no matter what you do. Assist springs wont really change that under play nearly as much as some will have it. Indeed, I've gotten to the point where instead of feeling like I need some kind of assist mechanism to tweek or fine tune BW, I'd rather use a basic stanwood approach and add a diagnostic to tweek the ratio key to key for more uniform touch. Then too is the point that adjustable touch weight schemes in the end address the static side of the equation more then the dynamic. To what degree is another discussion. Cheers RicB
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