I want to know about the interface of the typewriter/ printer he was working off of. Also what kinds of stencil guides were available at the time. My hot take a

I want to know about the interface of the typewriter/ printer he was working off of. Also what kinds of stencil guides were available at the time. My hot take after reading it: Did he have some way of 'setting' the stencils directly onto the printer in a very controlled way and the ability to 'pause' printing? IE, prints prints prints, pause, some stencil required, put in stencil into controlled space, make mark, remove stencil, press space bar, prints prints prints prints... It might also explain the '+' issues. It might have been a very small stencil and less well fit into a stencil guide.