I have one. You put an index card into it and poke with a..
   .with.. with a stainless steel pin with a ball at the end of it
   so it doesn't puncture the card.

   Want a proper braille-writer though. Back in the early 1990s, I
   tried to coax my dot matrix printer to do braille by printing
   heavily without a ribbon, braille in reverse. It actually
   worked! But not QUITE up to the standard I wanted.