Knight jack stop rail

[Jerry Cohen]

Terry,
I have never removed one, but eventually by turning the adjusting screws,
the rail has to fall off the end. I believe these screws are
counter-clockwise, so turning the screws clockwise makes the rail go towards
the strings.

I often find a separate jack stop rail on larger verticals, where there is
more room. The purpose of a separate rail is to improve repetition. After
the action is completely regulated, press down a key, and you should just
barely be able to pull the jack back a little further against the stop rail.
Since there is very little extra travel for the jack, the jack can get back
under the butt faster, for faster repetition. Frankly I have never seen a
jack stop rail on a new piano, adjusted this way. They are usually a mile
from stopping the jack. Maybe theory and practice diverge!

Jerry Cohen, RPT
NJ Chapter

-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf
Of pianolover 88
Sent: Tuesday, July 26, 2005 12:58 PM
To: PIANOTECH@PTG.ORG
Subject: Knight jack stop rail

Customer has a 1963ish Knight console. The jacks have its own stop rail, 
whereas on most pianos the letoff rail also has a felt strip on the back to 
dampen the impact of the jacks so as not to "click". The knight has BOTH a 
letoff rail AND a separate jack stop rail, but for some strange unknown 
reason, the latter was originally backed with FOAM instead of felt! Of 
course after 40 odd years that foam has literally turned to powder and the 
residue was everywhere! So after cleaning the action and doing some other 
repairs, I tried to remove the rail so I could back it with a fresh strip of

felt....But I cannot figure out how to get it out! It has four adjusting 
screws like those used for the letoff buttons, only these are longer and go 
through the rail and continue a couple more inches into the action frame. 
Turning each screw only results in moving the rail closer or further from 
the jacks,but does not appear to allow for the removal of the rail. So, I'm 
hoping someone here has experience with this configuration and can advise me

on the correct removal of this rail. Since the rail  is without backing at 
this point, the jacks do make audible clicks when playing, so maybe by 
regulating the rail so it's farther away from the jacks would lessen or stop

the clicks? Thanks in advance for any help in this matter.

Terry Peterson


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