[pianotech] capstain/wippen angle, was: key position at rest

[Ron Nossaman]

It strikes me that a good starting place is basic geometry, 
with the changing total distance from wippen center to balance 
rail hole via capstan contact point. If you start with the 
contact point below the magic line and end up with it above, 
that total distance changed from longer to shorter, to longer. 
If you set the contact point at the magic line at either the 
top or the bottom of the keystroke, the length change is one 
way. With the magic line centered in the stroke, how it it 
possible to maintain non sliding contact with the direction 
reversal? With the contact point not passing *through* the 
magic line, it very likely is.
Ron N