Of course you (and David) are correct here. Late at nite, looking <<too casually>> at a simple formula while forgetting its use in practice are my only excuse. My apologies for not being more careful. But now that we are clear of this, which also gets me past the bit where compensating for lead with assist springs leaves the SW ratio the same.... (the last being the stumble which got me into this mess) I still dont buy into the idea that 10 grams or more of lead switched out with equivalent in assist spring strength is going to result in the same <<feel>>. Cheers RicB 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. If all that one changes is FW, then the only thing that changes is BW. SWR stays the same as does Action Ratio and regulation. -- Regards, Jon Page
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