Grin... if you change the amount of FW, then you change the Ratio and you no longer have "an action with the same hammers, ratio, and BW, but different leading" You have an action with both different leading and different ratio. Moreover, the bulk of commentary along these lines so far would seem to support the claim that assist spring compensating for same BW after a change in FW will not be able to create the <<same feel>> (however one arrives at what that might eventually be) Cheers RicB 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.
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