Heavy hammers

[Mark Davidson]

RicB wrote:

>Clearly the postee was thinking in terms of 1 gram of hammer weight to 5
>grams of DW, and this is wrong. If the questoner had removed 2 grams of
>hammer weight the resulting action would be extremely light.
>
>Assuming that the above gram figures are Downweight figures, and
>assuming any reasonable UW you get an increase in BW of 6.5 grams. Which
>relates to about 1.2 grams of hammer SW.

Do not both UW and DW change?  I.e. isn't

DW = BW + friction, and
UW = BW - friction

So if you change BW wouldn't these both change?  
And looks like BW and DW would have the same change.
Am I missing something here?

-Mark