Steinway hammer Bore Angles

[Jon Page]

I bore 5 to 11 degrees for the bass, keeping the 5 degree angle for at least
the first six to nine notes. 79 to 90 (11 to 0) degrees in the tenor 
(to about note 52)
initially grouping hammers in threes for the 11, 10, 9 degrees and 
groups of two from
there to 52 (or more groups of three depending on compass).  Above 
that is 90 degrees.
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Regards,

Jon Page