jack hitting h.flange

[Jon Page]

At 03:51 PM 8/20/2002 -0500, you wrote:
>Jon,
>
>On the piano I examined, the problem was not that the wippen was lifting too
>high due to capstan placement. I substituted my finger for the capstan and
>found I could lift some of the jacks higher on some notes than on others.
>Those were the ones that clicked. With my particular piano, the artist
>wanted extra aftertouch. We could achieve it with all notes without the jack
>blocking against the front of the window, even with the thicker felt we
>(this was a collaborative effort with Rolf at Interlochen on one of his
>teacher's pianos) installed. The only problem was the few "athletic" jacks
>that seemed to want to jump higher and faster than the others. Gluing on the
>felts did not require re-regulating the piano or eliminating the aftertouch
>that the artist wanted. And the artist was happy with it.
>
>I do think, however, that the problem is inconsistent parts. This was the
>quickest and best solution we could come up with.
>
>Sincerely,
>Gary Mushlin, RPT

The trouble with gluing on extra felt is that if it might stop the jack's 
travel before the end of the keystroke.
In this case the glue joint between the fly and the tender will be stressed 
and failure is imminent.

I know of a B whose jacks 'bottom-out' when the keys are 1/16" above the 
front rail punchings. Long hammer blow
and shallower dip treated the symptoms. Moving the capstan forwards and 
relocating the heel will correct the geometry.

Jon page