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I've come across SS duplexes which are in tune and bring a musicality to the top octave and others which aren't. Steinway or Steinwas they should be in tune and if they're not intended to be and are not ...

Ed, Proximal is the direction needed (judging strictly by my ear). This is good to know but I've never done it. Don't want to scratch up the plate if possible though.  I have the duplex setup specs ...

I have one of these, somewhere.  I found this by searching "piano hammer head boring jig", then looking at Images.  I'm not sure if it's still for sale. https://www.google.com/imgres?imgurl=https%3A%2F%2Fforum.pianoworld.com%2F%2Fgallery%2F42%2Ffull%2F10678.jpg&tbnid=O6LWLExOq0gLiM&vet=12ahUKEwiL6LuqrYH-AhXDiO4BHf2NCf8QMygGegQIARBB..i&imgrefurl=https%3A%2F%2Fforum.pianoworld.com%2Fubbthreads.php%2Fgalleries%2F2779539%2Fun-named-hammer-boring-jig.html&docid=5OzY8T0yvQ69IM&w=800&h=600&q=piano%20hammer%20head%20boring%20jig&client=firefox-b-1-d&ved=2ahUKEwiL6LuqrYH-AhXDiO4BHf2NCf8QMygGegQIARBB ...