I wish to increase the touch weight of an upright player.  Am I asking
for trouble by replacing the hammer return springs with (Schaff) medium
or heavy gauge springs?  I suspect that the pneumatics can handle the
added load easily enough, but will the repetition rate be affected?

I am considering replacing the springs in one octave and running the
test roll through to test the effect on repetition rate at high/low
vacuum and with/without the soft pedal.  (Currently, the highest
repetition rate is notably (no pun intended) slower with the soft pedal
applied.)

Thanks for comments,
Larry Toto