2013 03 20 plotter etching tool

I'm trying to make my new (old) HP plotter an effective hologram machine. My first step was to build a simple etching tool holder for the plotter. I found this 3D model of a plotter pen: PlotterPen_Koh-I-Noor_6401_01F_ online (mentioned before in 2012-11-09) and made a drawing from it: PlotterPen_Koh-I-Noor_6401_01F_. I then made a simple replica of the body and ridge of the pen, with a hole in the end for a compass tip and a set screw. For now, I've just put a piece of pencil lead in the hole. Here's a picture:

Here it is installed in the plotter:

And here's the result:

It works!