fast repetition

[Greg Newell]

Eric Leatha wrote:
>
> Greg!
>
> If the back shoulder of the jack is just lightly grabbing the butt leather
> after catching (much like a grand backcheck catches a hammer tail), look at
> jack rotation.  I scratched my head on an M500 last month that had "sticky
> keys" when played with the damper pedal depressed.  Everything looked good,
> but when the moon was in alignment with Mars and that Hale-Bopp thing going
> on, the jack would lightly rest on the back of the butt leather.
> The solution?  Increase jack rotation by properly positioning the letoff
> rail.  The jack tender should contact the absolute center of the letoff
> button.
> A challenging puzzle for my supposedly dry morning of tuning tuning tuning.
--


Eric,
      The jack does fully clear the buckskin on full depression of the
key. Is this what you mean? The jack was not dragging on anything that I
could see. I've see too many situations where the back of the jack drags
against the letoff rail not to check that and I found good clearance.