Hammer boring & Teflon center pin height

[A440A@aol.com]

Dale  writes:

<< I don't see any problem lowering the stack  unless it changes the magic 
line of wippen center to bottom of balance pin  intersection of the capstan 
at 
half travel radically.
  Any body else notice this stuff or have any relevant  & helpful 
feedback...warnings? >>

The late 60's Steinway actions are all over the map. Before I began deciding 
on bore lengths, I would certainly put a few trial hammers on the shanks at 90 
degrees and then see how they mate with the strings.  Don't be surprised if 
you find so much string angle going up to the bridge that there is no way for 
the hammer to meet the string at 90 degrees, ergo, there is no way for the 
hammer to be parallel with the string at contact.  
     Also,  I have found it instructive to measure the action spread on these 
rails.  They are NOT consistant!  
Good luck,  
Ed Foote RPT 
http://www.uk-piano.org/edfoote/index.html
www.uk-piano.org/edfoote/well_tempered_piano.html