Proper action spread has the knuckle core aligned with the jack center at rest. In other words,
when the hammer is at rest, the knuckle core should be pointing at the jack center
Another aspect is rail heights. String height minus hammer bore (considering wear) equals Hammer Center Height (HCH).
The Wippen Center Height is 64 mm below HCH.
The last one of these that I worked on; I had to repin the top action get the friction correct on the hammers/jacks/rep lever;
to get the repetition working properly when adjusted through the player unit.
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Regards,
Jon Page
mailto:
jonpage@comcast.nethttp://www.pianocapecod.com------------------------------