Blade Housing for many vinyl cutters

I started to use the vinyl cutter/plotter (which is a CNC machine) at my local TechShop for drawing my sewing patterns directly on my fabric. So I made an adapter to fit a pen directly into our vinyl cutter. The vinyl cutter they have is a US Cutter Model SC and a US Cutter LaserPoint II. Both use the same cutter blade housing.

I'm posting this here so that you can modify this design to fit any kind of tool that you would like to put in your similar vinyl cutter/plotter. So basically I'm