Hi all I'm not quite sure I follow this either. All other things being equal, jack rest position just changes jack travel and timing. It will end up in the same position at full keystroke however... for that matter from the moment the tail engages things will be equal in both cases from that point onwards. This said... Skolnik covers a lot of good ground on this thread in a short space. Wims problem .... Wim, seems to me you have more or less eliminated the balancier centerpin tightness and the repetition tension from the field of potential sources of your problem. Strikes me as time to look for other sources. David listed up quite a few classics. Cheers RicB David writes: << The ability of the hammers to be held in check is affected by: <SINP> jack position at rest - too far forward will leave jack too close to knuckle after let-off, either allowing descending knuckle to bound on jack top, or the back radius of the knuckle will rub or otherwise push jack out of the way, stealing energy from the descending hammer that might prevent it from overcoming rep spring.>> I don't know that I understand this. I believe that the jack position at rest, if moved farther under the knuckle, will simply cause the jack to begin moving earlier in the keystroke, (for a given let-off). Once the jack is off the spoon, it doesn't matter where it started. It is helpful to place the action in check, then adjust the capstan so that the jack is equidistant between the knuckle and the stop pad. This is your optimum blow distance for that particular let-off and dip. Changing the beginning jack position won't have any effect on this. Regards, Ed Foote RPT http://www.uk-piano.org/edfoote/index.html www.uk-piano.org/edfoote/well_tempered_piano.html
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