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Aside: If you have an older AxiDraw...
First-generation AxiDraw V3 units had four threaded holes on the vertical slide
and two holes in the pen clip (rather than two threaded holes and four holes on
the pen clip.) If you have one of these machines, it looks a little dierent, but you
still use the two screws to attach the pen clip in the vertical or diagonal position.
The pen clip can be attached in two dierent positions: Vertical, which positions
the pen straight down, or diagonally, which holds the pen at a 45° angle to the
paper.