Even balance weight or even something else, that's thequestion.

[David C. Stanwood]

>Richard Brekne Wrote: 

>Front Weight specifications result in less then equally smooth Balance
Weights
>unless there is near absolute perfection in each and every point that
affects the
>total action ratio for each key. A nice diagnostic tool if its used for
that, but
>if such variance in total action ratio (however its taken) are left
unimproved,
>then that uneveness is reflected by an uneven BW curve.

Yes and this is one of the beautiful points of an equation balanced action
(PTD).  When SW and FW are set to smooth equation generated specs, the BW
becomes an indicator of ratio variations.  If the Balance Weight is not
right but all the weights are set to spec, then it has to be a ratio error.
 The BW points out the error.  The kind of uneveness you find in the BW is
usually on the order of + or - 2 grams on a good quality action, which is
no problemo for pianists.  An advantage of action designs which incorporate
adjustable support springs or variable gap magnets is that you can smooth
out these variations.  In either case the BW in an equation balance action
(w/springs or magnets OFF) can tell you if you have problem like a cocked
knuckle or a capstan that's out of place.

David Stanwood