Marsh makes a stencil making machine that might do what Mr. Taylor
needs.  It looks like an outsize version of a Dymo label maker, and
works nearly the same (we had one at a manufacturing plant where
I once worked).

While it punches the stencils out in the wrong direction for a piano
roll word master, some cutting and pasting should give a satisfactory
result.  These machines are very substantial and rugged.  They should
last forever.  Unfortunately, they're rather expensive (about
$1400.00).  W. W. Grainger sells them.

Dave Vincent