I have been sending hammers out for duplication to the Ronsen Piano
Hammer Company in Boiceville, New York, for quite a few years now
and have always been happy with their work.  I like to send all the
hammers at the angle breaks with the butts still attached so they
can accurately duplicate the angles.  The hammers are hand pressed
and really have a nice tonal quality.  I see they have a web site
here:

  http://www.ronsenhammer.com/index.php?nShow=3 

Ben Gottfried - Ben's Player Piano Service