<< n how crucial it is to get a good adjustment on the jack position for good regulation. I was hoping for a procedure that was more exact than a visual alignment on the section ends, draw a thread across the section, align the rest of the jacks to the thread. >> Two ways, both of which require individual examination of the jack/knuckle: 1. Visually align the jacks so that their distal edge is approx. .5mm proximal to the distal edges of the core, (or go ahead and line them up exactly if you need the insurance. it WILL cost you some sensitivity,though) 2. Play the note a F blow, bring the jack closer, play it again, bring it closer........ continue on until you feel that there is a loss of power, then return the jack just enough to restore the power. This is a technique that requires a lot of experience, (and time). Some actions will function perfectly with the jacks almost aligned with the near edge of the core, but that always seemed dangerous to me. 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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