> Could someone please enlighten me as to the purpose of Jack Stop Rails. I > hate those things and have been removing them for many years w/o any problem > occurring after the fact. In this part of the world these are known as slap rails, jack slap rail, damper slap rail and in many old German pianos in the late 19thC key slap rails. These are for conditions where the piano is being played at extreme velocities, almost viciously and abusively. I have only come across this problem once when playing a piano without a damper slap rail and the reaction of the dampers and associated noise was horrible. In traditional American actions there is no jack slap rail but instead there is a felt cushion behind the balance hammer below the tape aperture. Regards Alan Forsyth Edinburgh
This PTG archive page provided courtesy of Moy Piano Service, LLC